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Magnetic Materials

GMR Harddisk, courtesy IBM GermanyMagnetic phenomena are omnipresent in the modern world. The Nobel prize in Physics (2007) was awarded for studies of giant magnetoresistance to A. Fert and P. Grünberg; their discoveries were soon implemented in hard drives (see picture, courtesy of IBM Germany). Learn more about the current research into magnetic materials, basic or applied.

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Recent Articles

A Mixed-Ligand Approach for a Gigantic and Hollow Heterometallic Cage {Ni64RE96} for Gas Separation and Magnetic Cooling Applications

A Mixed‐Ligand Approach for a Gigantic and Hollow Heterometallic Cage {Ni64RE96} for Gas Separation and Magnetic Cooling Applications

The highest-nuclearity transition-metal–rare-earth heterometallic coordination cages {Ni64RE96} (RE=Gd, Dy, and Y) with a cuboidal porous structure have been synthesized by using a mixed-ligand approach to control the hydrolysis of the metal ions. These giant cluster complexes exhibit high selectivity for CO2 over CH4 or N2 at ambient temperature and large magnetocaloric effect at ultralow temperatures.

[Communication]
Wei-Peng Chen, Pei-Qin Liao, Youzhu Yu, Zhiping Zheng, Xiao-Ming Chen, Yan-Zhen Zheng
Angew. Chem. Int. Ed., June 27, 2016, DOI: 10.1002/anie.201603907. Read article

In Situ Nanoscale Electric Field Control of Magnetism by Nanoionics

In Situ Nanoscale Electric Field Control of Magnetism by Nanoionics

Direct, nonvolatile, and reversible control of nanomagnetism in solid-state ferromagnetic thin films is achieved by controlling the chemical composition of the film through field-driven ion redistribution. The electric field-driven de-intercalation/intercalation of lithium ions can result in ≈100% modulation of the magnetization and drives domain wall motion over ≈100 nm. High-speed and multilevel magnetic information storage is further demonstrated.

[Communication]
Xiaojian Zhu, Jiantao Zhou, Lin Chen, Shanshan Guo, Gang Liu, Run-Wei Li, Wei D. Lu
Adv. Mater., June 27, 2016, DOI: 10.1002/adma.201601425. Read article

Synergistic Combination of Multistage Magnetic Guidance and Optimized Ligand Density in Targeting a Nanoplatform for Enhanced Cancer Therapy

Synergistic Combination of Multistage Magnetic Guidance and Optimized Ligand Density in Targeting a Nanoplatform for Enhanced Cancer Therapy

Trastuzumab-targeted, doxorubicin-encapsulated magnetic nanocarriers (T-Dox-MNCs) synthesized using thiol-functionalized poly(methacrylic acid)-grafted poly(vinyl alcohol) copolymer (PVA/PMASH) and superparamagnetic nanoparticles can generate tunable bridging sites for precise Tra conjugation and controlled pH-sensitive drug release. With precise Tra density and multiple-stage magnetic targeting, localized accumulation and intratumoral distribution of therapeutic T-Dox-MNCs are improved, increasing the efficient efficacy of the cancer therapy.

[Full Paper]
Chih-Sheng Chiang, Yi-Shang Shen, Jun-Jen Liu, Woei-Cherng Shyu, San-Yuan Chen
Adv. Healthcare Mater., June 23, 2016, DOI: 10.1002/adhm.201600479. Read article

Quantitative, In Situ Visualization of Metal-Ion Dissolution and Transport Using 1H Magnetic Resonance Imaging

Quantitative, In Situ Visualization of Metal‐Ion Dissolution and Transport Using 1H Magnetic Resonance Imaging

Insights into corrosion processes: Magnetic resonance imaging is used to quanititatively map the distribution of copper(II) ions during the electrodissolution of metallic copper (see picture). The method is non-invasive and can be applied in situ, in three dimensions, and in real time. The dissolution of Cu2+ ions is shown to be non-uniform across the anode.

[Communication]
Joshua M. Bray, Alison J. Davenport, Karl S. Ryder, Melanie M. Britton
Angew. Chem. Int. Ed., June 22, 2016, DOI: 10.1002/anie.201604310. Read article

Pulsed-Electromagnetic-Field-Assisted Reduced Graphene Oxide Substrates for Multidifferentiation of Human Mesenchymal Stem Cells

Pulsed‐Electromagnetic‐Field‐Assisted Reduced Graphene Oxide Substrates for Multidifferentiation of Human Mesenchymal Stem Cells

Reduced graphene oxide (RGO) substrates and pulsed electromagnetic fields (PEMFs) are applied to human mesenchymal stem cells (hMSCs) and their efficacy for differentiation is evaluated. Not only the RGO and PEMFs but also the induced electric current synergistically enhance the multidifferentiation of hMSCs. Consequently, this system would be a turning point in tissue engineering and regenerative medicine.

[Full Paper]
Ki-Taek Lim, Hoon Seonwoo, Kyung Soon Choi, Hexiu Jin, Kyung-Je Jang, Jangho Kim, Jin-Woo Kim, Soo Young Kim, Pill-Hoon Choung, Jong Hoon Chung
Adv. Healthcare Mater., June 22, 2016, DOI: 10.1002/adhm.201600429. Read article

Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn2Au and Mn2Au/Fe Bilayers

Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn2Au and Mn2Au/Fe Bilayers

Mn2Au, a bimetallic antiferromagnet, is considered an interesting high Néel temperature candidate within the emerging field of antiferromagnetic spintronic devices. An anomalous anisotropic magnetoresistance effect is observed with four peaks, persisting to room-temperature for a field as low as 200 mT, demonstrating how Mn2Au spins can be viewed and controlled at room-temperature and offering a route to room-temperature antiferromagnetic spintronics.

[Full Paper]
Han-Chun Wu, Mohamed Abid, Alan Kalitsov, Pavel Zarzhitsky, Mourad Abid, Zhi-Min Liao, Cormac Ó Coileáin, Hongjun Xu, Jing-Jing Wang, Huajun Liu, Oleg N. Mryasov, Ching-Ray Chang, Igor V. Shvets
Adv. Funct. Mater., June 22, 2016, DOI: 10.1002/adfm.201601348. Read article

Iron Oxide Nanoparticles Labeled with an Excited State Intramolecular Proton Transfer Dye

Excited State Intramolecular Proton Transfer (ESIPT) is a particular well known reaction that has been very little studied in magnetic environments. In this work, we report on the photophysical behavior of a known ESIPT dye of the benzothiazole class, when in solution with uncoated superparamagnetic iron oxide nanoparticles, and when grafted to silica-coated iron oxide nanoparticles. Uncoated iron oxide nanoparticles promoted the fluorescence quenching of the ESIPT dye, resulting from collisions during the lifetime of the excited state. The assembly of iron oxide nanoparticles with a shell of silica provided recovery of the ESIPT emission, due to the isolation promoted by the silica shell. The silica network gives protection against the fluorescence quenching of the dye, allowing the nanoparticles to act as a bimodal (optical and magnetic) imaging contrast agent with a large Stoke shift.

[Communication]
Elisa Magno Nunes Oliveira, Felipe Lange Coelho, Mara Lise Zanini, Ricardo Meurer Papaléo, Leandra Franciscato Campo
ChemPhysChem, June 21, 2016, DOI: 10.1002/cphc.201600472. Read article

Engineering Iron Oxide Hollow Nanospheres to Enhance Antimicrobial Property: Understanding the Cytotoxic Origin in Organic Rich Environment

Engineering Iron Oxide Hollow Nanospheres to Enhance Antimicrobial Property: Understanding the Cytotoxic Origin in Organic Rich Environment

A novel strategy for preparing iron oxide nanoparticles with surprisingly high antimicrobial activity and excellent safety to mammalian cells is developed. Magnetic hollow nanospheres (HNSs) have superior antimicrobial activity as compared to hematite HNSs and conventional magnetites, signifying that control over both the composition and nanostructure is crucial to tune the antimicrobial activity and biosafety of iron oxides.

[Full Paper]
Yusilawati Ahmad Nor, Liang Zhou, Anand Kumar Meka, Chun Xu, Yuting Niu, Hongwei Zhang, Neena Mitter, Donna Mahony, Chengzhong Yu
Adv. Funct. Mater., June 21, 2016, DOI: 10.1002/adfm.201601459. Read article

Simple Engineering of Polymer-Nanoparticle Hybrid Nanocapsules

A general method to generate hybrid hollow capsules is reported. The process is based on the stabilization of solvent droplets by nanoparticles, in macroscopically miscible mixtures of THF and water. After addition of a crosslinking polymer and removal of the solvent core, capsules of diameter ca 100 nm are obtained. This novel strategy does not require the use of block copolymers. In contrast, most methods reporting the formation of hybrid nanocapsules incorporate nanoparticles into block-copolymer polymersomes or use nanoparticles tethered with block-copolymers. The nanocapsules were characterized using a full set of techniques including nanoparticle tracking analysis, electron microscopy and liquid phase atomic force microscopy. Our results show that the vesicular shape of the nanocapsules is templated by the liquid droplets. Nanocapsules were prepared from Quantum Dots, gold nanoparticles, superparamagnetic iron oxide nanoparticles and mixtures of particles. The entrapment of a fluorescent dye was also demonstrated. Thus, nanocapsules with dual properties (e.g. magnetic and fluorescent) are easily obtained.Interestingly, the magnetic nanocapsules enable Magnetic Resonance Imaging contrast enhancement of tumors in vivo.

[Communication]
Flavien Sciortino, Gérald Casterou, Pierre-Antoine Eliat, Marie-Bérengère Troadec, Cédric Gaillard, Soizic Chevance, Myrtil L Kahn, Fabienne Gauffre
ChemNanoMat, June 20, 2016, DOI: 10.1002/cnma.201600155. Read article

Magnetic Nanoparticles-Supported Chiral Catalyst with an Imidazolium Ionic Moiety: An Efficient and Recyclable Catalyst for Asymmetric Michael and Aldol Reactions

Magnetic Nanoparticles-Supported Chiral Catalyst with an Imidazolium Ionic Moiety: An Efficient and Recyclable Catalyst for Asymmetric Michael and Aldol Reactions

[Full Paper]
Anguo Ying, Shuo Liu, Zhifeng Li, Gang Chen, Jianguo Yang, Hua Yan, Songlin Xu
Adv. Synth. Catal., June 16, 2016, DOI: 10.1002/adsc.201600145. Read article.

Anion-Directed Entangling Coordination Networks: Luminescence Sensing and Magnetic Properties

Anion‐Directed Entangling Coordination Networks: Luminescence Sensing and Magnetic Properties

In a bind: Two anion-directed entangling coordination networks have been prepared, one of which shows potential for applications in chemical sensors for nitrobenzene and Fe3+ ions„ whereby strong antiferromagnetic interactions are also found between the CuII centers (see figure).

[Full Paper]
Cheng-Peng Li, Qi Chen, Yu-Hai Mu, Miao Du
ChemPlusChem, June 16, 2016, DOI: 10.1002/cplu.201600155. Read article

Implementing Room-Temperature Multiferroism by Exploiting Hexagonal-Orthorhombic Morphotropic Phase Coexistence in LuFeO3 Thin Films

Implementing Room‐Temperature Multiferroism by Exploiting Hexagonal‐Orthorhombic Morphotropic Phase Coexistence in LuFeO3 Thin Films

Room-temperature multiferroism in LuFeO3 (LFO) films is demonstrated by exploiting the orthorhombic-hexagonal (o-h) morphotrophic phase coexistence. The LFO film further reveals magnetoelectric coupling effect that is not shown in single-phase (h- or o-) LFO. The observed multiferroism is attributed to the combination of sufficient polarization from h-LFO and net magnetization from o-LFO.

[Communication]
Seungwoo Song, Hyeon Han, Hyun Myung Jang, Young Tae Kim, Nam-Suk Lee, Chan Gyung Park, Jeong Rae Kim, Tae Won Noh, James F. Scott
Adv. Mater., June 16, 2016, DOI: 10.1002/adma.201601989. Read article

Growth and properties of self-catalyzed (In,Mn)As nanowires

Growth and properties of self‐catalyzed (In,Mn)As nanowires

(In,Mn)As nanowires with high crystalline quality without any crystal defects, such as dislocations, stacking faults or precipitates inside the investigated nanowires or on their side-walls, were grown using Mn-assisted molecular-beam epitaxy at relatively high temperature range. At the same time, the growth processes of the nanowires were accompanied by the formation of MnAs precipitates between the nanowires at the interface of the wetting layer.

[Rapid Research Letter]
Alexei Bouravleuv, George Cirlin, Rodion Reznik, Artem Khrebtov, Yuriy Samsonenko, Peter Werner, Ilya Soshnikov, Alexander Savin, Harri Lipsanen
Phys. Status Solidi RRL, June 15, 2016, DOI: 10.1002/pssr.201600097. Read article

Using Nuclear Spin Noise Spectroscopy to Monitor Slow Magnetization Build-up at Millikelvin Temperature

At ultra-low temperatures longitudinal nuclear magnetic relaxation times become exceedingly long and spectral lines are very broad. These facts pose particular challenges for the measurement of nuclear magnetic resonance spectra and spin relaxation phenomena. We have used nuclear spin noise spectroscopy to monitor the proton spin polarization build-up to its thermal equilibrium of a mixture of glycerol, water and copper oxide nanoparticles at 17.5 mK in a static magnetic field of 2.5 T. Relaxation times determined in such a way were essentially free from perturbations caused by excitation radio frequency pulses, radiation damping and insufficient excitation bandwidth. The experimental spin-lattice relaxation times determined on resonance by saturation recovery using spin noise detection are consistently longer than the ones determined involving pulse excitation. These longer values are in better accordance with expected field dependence trend than the ones obtained by on-resonance experiments with pulsed excitation.

[Article]
Maria Theresia Pöschko, David Peat, John Owers-Bradley, Norbert Müller
ChemPhysChem, June 15, 2016, DOI: 10.1002/cphc.201600323. Read article

Graphene-Based Films with Integrated Strength and Toughness via a Novel Two-Step Method Combining Gel Casting and Surface Crosslinking

Graphene‐Based Films with Integrated Strength and Toughness via a Novel Two‐Step Method Combining Gel Casting and Surface Crosslinking

Mechanically robust graphene-based films were fabricated by a simple, environmentally friendly, and scalable two-step method combining gel casting and surface crosslinking.

[Full Paper]
Shibing Ye, Bin Chen, Dingding Hu, Changzhen Liu, Jiachun Feng
ChemNanoMat, June 15, 2016, DOI: 10.1002/cnma.201600127. Read article

Self-assembly of a linear Ni9 triple helical supramolecule with dominant ferromagnetic interactions

A linear triple helical supramolecule Ni9L6 has been prepared through a controllable self-assembly approach using 1,3-bis-(3-Oxo-3-phenylpropionyl)-2-hydroxy-5-methylbenzene (H3L) and Ni(OAc)2 under solvothermal condition. Single crystal X-ray diffraction analysis confirms the axial C3 symmetrical helical structure of the product and the temperature dependent magnetic susceptibility corresponds to a typical shape of ferromagnetic system.

[Communication]
Rui Jin, Zhong Sheng Cai, Xuan Feng Jiang, Li Min Zheng, Shu Yan Yu
Chem. Asian J., June 15, 2016, DOI: 10.1002/asia.201600694. Read article

Synthesis of Ferromagnetic Fe0.6Mn0.4O Nanoflowers as a New Class of Magnetic Theranostic Platform for In Vivo T1-T2 Dual-Mode Magnetic Resonance Imaging and Magnetic Hyperthermia Therapy

Synthesis of Ferromagnetic Fe0.6Mn0.4O Nanoflowers as a New Class of Magnetic Theranostic Platform for In Vivo T1‐T2 Dual‐Mode Magnetic Resonance Imaging and Magnetic Hyperthermia Therapy

Room-temperature ferromagnetic Fe0.6Mn0.4O nanoflowers synthesized by the facile one-pot high-temperature thermal decomposition method, have been successfully developed as an innovative theranostic agent with in vivo T1-T2 dual-mode magnetic resonance imaging for diagnostic applications and therapeutic interventions via magnetic hyperthermia. It provides a new optimization strategy of the composition and structure of magnetic nanoparticles for multimodality cancer diagnostics and therapy.

[Full Paper]
Xiao Li Liu, Cheng Teng Ng, Prashant Chandrasekharan, Hai Tao Yang, Ling Yun Zhao, Erwin Peng, Yun Bo Lv, Wen Xiao, Jie Fang, Jia Bao Yi, Huan Zhang, Kai-Hsiang Chuang, Boon Huat Bay, Jun Ding, Hai Ming Fan
Adv. Healthcare Mater., June 14, 2016, DOI: 10.1002/adhm.201600357. Read article

Construction of 3D Metallic Nanostructures on an Arbitrarily Shaped Substrate

Construction of 3D Metallic Nanostructures on an Arbitrarily Shaped Substrate

Constructing conductive/magnetic nanowire arrays with 3D features by electrodeposition remains challenging. An unprecedented fabrication approach that allows to construct metallic (cobalt) nanowires on an arbitrarily shaped surface is reported. The spatial separation of nanowires varies from 70 to 3000 nm and the line width changes from 50 to 250 nm depending on growth conditions.

[Communication]
Fei Chen, Jingning Li, Fangfang Yu, Di Zhao, Fan Wang, Yanbin Chen, Ru-Wen Peng, Mu Wang
Adv. Mater., June 13, 2016, DOI: 10.1002/adma.201602049. Read article

Magnetic Multivalent Trehalose Glycopolymer Nanoparticles for the Detection of Mycobacteria

Magnetic Multivalent Trehalose Glycopolymer Nanoparticles for the Detection of Mycobacteria

A multivalent trehalose-grafted poly(lactic acid) is synthesized and encapsulated with iron oxide magnetic nanoparticles. The magnetic micelles interact with Mycobacterium smegmatis to form orange clusters. Very little particle interaction is found on Staphylococcus epidermidis 35984 or Escherichia coli ORN 208. The presented new approach to the detection of mycobacteria does not require molecular biology reagents or sophisticated instruments.

[Communication]
Xuan Chen, Bin Wu, Kalana W. Jayawardana, Nanjing Hao, H. Surangi N. Jayawardena, Robert Langer, Ana Jaklenec, Mingdi Yan
Adv. Healthcare Mater., June 10, 2016, DOI: 10.1002/adhm.201600071. Read article

Temporal Modulation of Stem Cell Activity Using Magnetoactive Hydrogels

Temporal Modulation of Stem Cell Activity Using Magnetoactive Hydrogels

A magnetoactive hydrogel cell culture system is developed and characterized whose mechanical properties can be temporally and reversibly tuned through magnetic fields. Mesenchymal stem cells cultured on this system exhibit changes in morphology, proangiogenic potential, and their osteogenic differentiation potential is dependent on their mechanical history.

[Full Paper]
Amr A. Abdeen, Junmin Lee, N. Ashwin Bharadwaj, Randy H. Ewoldt, Kristopher A. Kilian
Adv. Healthcare Mater., June 08, 2016, DOI: 10.1002/adhm.201600349. Read article

Ultrathin Epitaxial Ferromagnetic γ-Fe2O3 Layer as High Efficiency Spin Filtering Materials for Spintronics Device Based on Semiconductors

Ultrathin Epitaxial Ferromagnetic γ‐Fe2O3 Layer as High Efficiency Spin Filtering Materials for Spintronics Device Based on Semiconductors

A spin polarization of the tunneled current as high as −94.3% at 2 K is achieved in epitaxial and ultrathin γ-Fe2O3 layer. This work emphasizes that ferrimagnetic insulator spinel ferrites with high Curie temperatures are very promising materials as candidates for spintronics, particularly for spin injection into semiconductors.

[Full Paper]
Peng Li, Chuan Xia, Zhiyong Zhu, Yan Wen, Qiang Zhang, Husam N. Alshareef, Xi-Xiang Zhang
Adv. Funct. Mater., June 01, 2016, DOI: 10.1002/adfm.201504999. Read article

Structural and Magnetic Properties of 2p-3d-4f Hetero-Tri-Spin Chains Comprising [{Cu(hfac)2-Radical}2] Dimers and Ln(hfac)3 (hfac=hexafluoroacetylacetonate)

Structural and Magnetic Properties of 2p‐3d‐4f Hetero‐Tri‐Spin Chains Comprising [{Cu(hfac)2‐Radical}2] Dimers and Ln(hfac)3 (hfac=hexafluoroacetylacetonate)

Chain gang: A series of 2p-3d-4f chains that feature [{Cu(hfac)2-radical}2] dimer rings bridged by Ln(hfac)3 units have been obtained (see figure). The Tb and Dy compounds show field-induced slow magnetic relaxation behaviors.

[Full Paper]
Mei Zhu, Meng Yang, Juanjuan Wang, Hongdao Li, Licun Li
Chem. Asian J., May 31, 2016, DOI: 10.1002/asia.201600383. Read article

Utilization of the Antiferromagnetic IrMn Electrode in Spin Thermoelectric Devices and Their Beneficial Hybrid for Thermopiles

Utilization of the Antiferromagnetic IrMn Electrode in Spin Thermoelectric Devices and Their Beneficial Hybrid for Thermopiles

A simple and straightforward method of spin thermopiling using antiferromagnetic IrMn is demonstrated. The IrMn is a novel electrode in spin thermoelectrics not only for enhanced thermopower but also for modulation of magnetic configuration. The scalable signal amplification in spin thermopiles with exchange-biased structures allowing a large-area application paves the way toward the development of practical thermoelectric devices.

[Full Paper]
Dong-Jun Kim, Kyeong-Dong Lee, Srivathsava Surabhi, Soon-Gil Yoon, Jong-Ryul Jeong, Byong-Guk Park
Adv. Funct. Mater., May 30, 2016, DOI: 10.1002/adfm.201505514. Read article

High On/Off Ratio Memristive Switching of Manganite/Cuprate Bilayer by Interfacial Magnetoelectricity

High On/Off Ratio Memristive Switching of Manganite/Cuprate Bilayer by Interfacial Magnetoelectricity

When an external electric field is applied to a bilayer junction of La0.7Ca0.3MnO3 (LCMO) and PrBa2Cu3O7 (PBCO), it alters the positions of the Mn atoms at the LCMO/PBCO interface, turning On/Off a magnetic dead layer (MDL). The switching of MDL causes memristive hysteresis in the LCMO/PBCO bilayer junction.

[Full Paper]
Xiao Shen, Timothy J. Pennycook, David Hernandez-Martin, Ana Pérez, Yevgeniy S. Puzyrev, Yaohua Liu, Suzanne G. E. te Velthuis, John W. Freeland, Padraic Shafer, Chenhui Zhu, Maria Varela, Carlos Leon, Zouhair Sefrioui, Jacobo Santamaria, Sokrates T. Pantelides
Adv. Mater. Interfaces, May 27, 2016, DOI: 10.1002/admi.201600086. Read article

Development of an Electrochemical Immunoassay for the Detection of Polybrominated Diphenyl Ethers (PBDEs)

Development of an Electrochemical Immunoassay for the Detection of Polybrominated Diphenyl Ethers (PBDEs)

[Full Paper]
Francesca Bettazzi, Tania Martellini, Weilin L. Shelver, Alessandra Cincinelli, Eudes Lanciotti, Ilaria Palchetti
Electroanalysis, May 23, 2016, DOI: 10.1002/elan.201600127. Read article

Active Steerable Catalytic Supraparticles Shuttling on Preprogrammed Vertical Trajectories

Active Steerable Catalytic Supraparticles Shuttling on Preprogrammed Vertical Trajectories

This study describes the preparation of mm-sized self-propelling elevator supraparticles with a catalytically active patch able to perform oscillating elevator motion, where the trajectories can be controlled by magnets. These supraparticles able to explore full 3D-space, are then shown to be able to perform chemical tasks, as demonstrated for the case of decomposing starch on its trajectory.

[Full Paper]
Marcel Sperling, Hyung-Ju Kim, Orlin D. Velev, Michael Gradzielski
Adv. Mater. Interfaces, May 23, 2016, DOI: 10.1002/admi.201600095. Read article

Magnetocaloric Effect of Two Isostructural Heterometallic Organic Frameworks Based on {MIIGdIII2} Clusters (MII=Mn, Ni)

Magnetocaloric Effect of Two Isostructural Heterometallic Organic Frameworks Based on {MIIGdIII2} Clusters (MII=Mn, Ni)

Cool chemistry: Two isostructural 3D heterometallic coordination polymers (HCPs) based on {MIIGdIII2} clusters were synthesized (see figure) that present high thermal stability. According to magnetic results, they represent rare examples of multidimensional HCP-based magnetic refrigerants.

[Full Paper]
Shaowei Zhang, Peng Cheng
ChemPlusChem, May 20, 2016, DOI: 10.1002/cplu.201600143. Read article

Resolving Electronic Transitions in Synthetic Fluorescent Protein Chromophores by Magnetic Circular Dichroism

Resolving Electronic Transitions in Synthetic Fluorescent Protein Chromophores by Magnetic Circular Dichroism

Better understanding: Magnetic circular dichroism for a series of fluorescent protein chromophore derivatives provides specific spectral patterns, and in connection with density functional theory simulations it can be used for rational design of fluorescent probes.

[Article]
Petr Štěpánek, Thomas Y. Cowie, Martin Šafařík, Jaroslav Šebestík, Radek Pohl, Petr Bouř
ChemPhysChem, May 12, 2016, DOI: 10.1002/cphc.201600313. Read article

Magnetic State of Multilayered Synthetic Antiferromagnets during Soliton Nucleation and Propagation for Vertical Data Transfer

Magnetic State of Multilayered Synthetic Antiferromagnets during Soliton Nucleation and Propagation for Vertical Data Transfer

Probing the magnetic state of magnetic multilayer systems during vertical data transfer is very challenging compared to standard planar devices. Here, by using magnetoresistance measurements and polarized neutron reflectometry, the detailed spin configuration of such systems is determined, showing how small interfacial differences between magnetic layers affect their operation.

[Full Paper]
Amalio Fernández-Pacheco, Nina-Juliane Steinke, Dishant Mahendru, Alexander Welbourne, Rhodri Mansell, Shin L. Chin, Dorothée Petit, JiHyun Lee, Robert Dalgliesh, Sean Langridge, Russell P. Cowburn
Adv. Mater. Interfaces, May 09, 2016, DOI: 10.1002/admi.201600097. Read article

Fluorinated POSS-Star Polymers for 19F MRI

Fluorinated POSS‐Star Polymers for 19F MRI

Novel hybrid star polymers with a polyhedral oligomeric silsesquioxane core and eight partly fluorinated copolymer arms are synthesized through R-group approach by reversible addition–fragmentation chain transfer (RAFT) polymerization. The 19F magnetic resonance imaging (MRI) capability is preliminarily confirmed by a single and strong 19F resonance in 19F nuclear magnetic resonance (NMR), and the imaging intensity is also calculated for a spin-echo pulse sequence.

[Full Paper]
Kewei Wang, Hui Peng, Kristofer J. Thurecht, Andrew K. Whittaker
Macromol. Chem. Phys., May 06, 2016, DOI: 10.1002/macp.201600084. Read article

An Organic Spin Valve Embedding a Self-Assembled Monolayer of Organic Radicals

An Organic Spin Valve Embedding a Self‐Assembled Monolayer of Organic Radicals

Self-assembling of monolayer has been used to include a nitronyl-nitroxide radical in organic spin-valves demonstrating that the presence of the molecular paramagnetic layer does not hamper the observation of a significant magnetoresistance that is altered by a spin filtering exerted by this engineered spinterface.

[Full Paper]
Lorenzo Poggini, Giuseppe Cucinotta, Abdul-Muizz Pradipto, Marco Scarrozza, Paolo Barone, Andrea Caneschi, Patrizio Graziosi, Marco Calbucci, Raimondo Cecchini, Valentin Alek Dediu, Silvia Picozzi, Matteo Mannini, Roberta Sessoli
Adv. Mater. Interfaces, May 06, 2016, DOI: 10.1002/admi.201500855. Read article

Expansion of a Discrete [3 × 3] Mn9 Metallogrid to a µ-Carboxylato-Bridged Polymeric {Mn11}n Assembly

Expansion of a Discrete [3 × 3] Mn9 Metallogrid to a µ-Carboxylato-Bridged Polymeric {Mn11}n Assembly

Discrete and polymeric metallogrid compounds based on the [3 × 3] nonamanganese(II) square grid motif and featuring additional manganese(II) ions linked to the grid core were isolated. DC magnetic data show the successful expansion of the grid-type architectures based on tritopic bis(hydrazone) ligands appended with terminal pyruvate groups.

[Full Paper]
Avinash Lakma, Sayed Muktar Hossain, Rabindra Nath Pradhan, Dinesh Topwal, Andrea Cornia, Akhilesh Kumar Singh
Eur. J. Inorg. Chem., April 27, 2016, DOI: 10.1002/ejic.201600153. Read article.

Tuning the Magnetoluminescence Behavior of Lanthanide Complexes Having Sphenocorona and Cubic Coordination Geometries

Tuning the Magnetoluminescence Behavior of Lanthanide Complexes Having Sphenocorona and Cubic Coordination Geometries

LnIII complexes (Ln = Dy, Ho, Tb) with distinctly different coordination geometries, namely, sphenocorona and cubic, are synthesized. The different coordination geometries around the LnIII centers significantly modulate the slow magnetic relaxation and photoluminescence behaviors of the complexes, as revealed from AC magnetic susceptibility and solid-state luminescence studies, respectively.

[Full Paper]
Soumyabrata Goswami, Soumava Biswas, Kapil Tomar, Sanjit Konar
Eur. J. Inorg. Chem., April 26, 2016, DOI: 10.1002/ejic.201600152. Read article.

Synthesis, Characterization, Magnetic Properties, and Topological Aspects of Isoskeletal Heterometallic Hexanuclear CoII4LnIII2 Coordination Clusters Possessing 2,3,4M6–1 Topology

Synthesis, Characterization, Magnetic Properties, and Topological Aspects of Isoskeletal Heterometallic Hexanuclear CoII4LnIII2 Coordination Clusters Possessing 2,3,4M6–1 Topology

The use of a diprotic Schiff base ligand (H2L1) with Co(NO3)2 6H2O and LnCl3 x(H2O) afforded a family of hexanuclear coordination clusters formulated as [CoII4LnIII23-OH)2(L1)4Cl2(NO3)2(MeOH)4] 3(Et2O) where Ln is Y(1), Gd (2), Dy (3), and Tb (4). The topology of these compounds is 2,3,4M61. Compound 3 shows single molecule magnet (SMM) behavior.

[Full Paper]
Kieran Griffiths, Ghenadie Novitchi, George E. Kostakis
Eur. J. Inorg. Chem., April 21, 2016, DOI: 10.1002/ejic.201600078. Read article.

Helical CuICuII3 Metallocavitands with Sulfur-Containing Schiff Base Ligands Exhibiting Ferromagnetic or Antiferromagnetic Interactions

Helical CuICuII3 Metallocavitands with Sulfur-Containing Schiff Base Ligands Exhibiting Ferromagnetic or Antiferromagnetic Interactions

Helical CuICuII3 metallocavitands were created by the one-pot reaction of D-penicillamine, salicylaldehydes, R3N, and CuII. Each metallocavitand is composed of three CuII square planes that form a cyclic wall capped with a CuI trigonal plane, accommodating an R3NH+ ion in its cavity. The magnetic behavior of the metallocavitands was altered by changing a substituent on the ligand.

[Communication]
Asako Igashira-Kamiyama, Masayuki Saito, Shuntaro Kodera, Takumi Konno
Eur. J. Inorg. Chem., April 19, 2016, DOI: 10.1002/ejic.201600290. Read article.

Two Six-Connected MOFs with Distinct Architecture: Synthesis, Structure, Adsorption, and Magnetic Properties

Two Six‐Connected MOFs with Distinct Architecture: Synthesis, Structure, Adsorption, and Magnetic Properties

Well connected: Two unusual six-connected metal–organic frameworks were constructed by assembling CoII ions, 5-(4-pyridyl)tetrazole and formate ions. With slight modulation of the coordination environment of the trinuclear cobalt cluster, the two complexes take on completely distinct structures (see figure). One of the complexes strongly interacts with CO2 and might potentially serve as an adsorption material.

[Full Paper]
Guo-Jian Ren, Song-De Han, Yan-Qing Liu, Tong-Liang Hu, Xian-He Bu
ChemPlusChem, April 01, 2016, DOI: 10.1002/cplu.201600092. Read article

Three Cluster Organic Frameworks Constructed from Tetranuclear Cluster Units: Structure and Properties

Three Cluster Organic Frameworks Constructed from Tetranuclear Cluster Units: Structure and Properties

Rare connections: Three isostructural cluster organic 3D metal–organic frameworks (MOFs) are constructed by combining a semirigid multi-carboxylic acid with tetranuclear metal–hydroxy–carboxyl clusters (see figure). Manganese and cobalt MOFs showed significant antiferromagnetic interactions between intracluster metal ions, whereas the cadmium MOF reveals strong blue photoluminescence.

[Full Paper]
Ge Liu, Dong Xie, Rui Li, Lei Hou, Wen-Yan Zhang, Yao-Yu Wang
ChemPlusChem, March 11, 2016, DOI: 10.1002/cplu.201600025. Read article

Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

Very odd indeed! A new molecular nanomagnet, Cr8Mn, is found to exhibit spin frustration. Inelastic neutron scattering and muon spin relaxation probe the low energy spin dynamics of this compound revealing a ground state that fluctuates in spin chirality.

[Full Paper]
Michael L. Baker, Tom Lancaster, Alessandro Chiesa, Giuseppe Amoretti, Peter J. Baker, Claire Barker, Stephen J. Blundell, Stefano Carretta, David Collison, Hans U. Güdel, Tatiana Guidi, Eric J. L. McInnes, Johannes S. Möller, Hannu Mutka, Jacques Ollivier, Francis L. Pratt, Paolo Santini, Floriana Tuna, Philip L. W. Tregenna-Piggott, Iñigo J. Vitorica-Yrezabal, Grigore A. Timco, Richard E. P. Winpenny
Chem. Eur. J., January 8, 2016, DOI: 10.1002/chem.201503431. Read article.

[U(bipy)4]: A Mistaken Case of U0?

[U(bipy)4]: A Mistaken Case of U0?

U bet your bipy: Lost to time but not forgotten, the first reported and isolable “U0” complex [U(bipy)4] has been synthesized and reinvestigated (see figure). Through a thorough investigation, definitive oxidation state assignments have been made. [U(bipy)4], along with its reduced product [Na(THF)6][U(bipy)4], are revealed to be highly reduced species with U-centers in mid-to-high oxidation states.

[Communication]
Skye Fortier, José Veleta, Amélie Pialat, Jennifer Le Roy, Kamran B. Ghiassi, Marilyn M. Olmstead, Alejandro Metta-Magaña, Muralee Murugesu, Dino Villagrán
Chem. Eur. J., January 7, 2016, DOI: 10.1002/chem.201504982. Read article.

Does the Sign of the Cu–Gd Magnetic Interaction Depend on the Number of Atoms in the Bridge?

Does the Sign of the Cu–Gd Magnetic Interaction Depend on the Number of Atoms in the Bridge?

Bridge over Cu–Gd: Observation of ferromagnetic Cu–Gd exchange interactions through one- and three-atom bridges and of antiferromagnetic Cu–Gd exchange interactions through two-atoms bridges is consistent with an active spin polarization mechanism in Cu–Gd complexes (see figure).

[Full Paper]
Jean-Pierre Costes, Carine Duhayon, Sonia Mallet-Ladeira, Sergiu Shova, Laure Vendier
Chem. Eur. J., January 7, 2016, DOI: 10.1002/chem.201504238. Read article.

Spectroscopic and Computational Investigation of Low-Spin MnIII Bis(scorpionate) Complexes

Spectroscopic and Computational Investigation of Low-Spin MnIII Bis(scorpionate) Complexes

Homoleptic MnIII complexes of the scorpionate Tp and Tp* ligands are rare examples of low-spin MnIII species. The electronic structures of these species were compared using MCD spectroscopy and CASSCF/NEVPT2 computations. Complementary computations for the related [{Ph(MeIm)3B}2MnIII]+ species, which features an NHC ligand, explain variations in zero-field splitting for these complexes.

[Full Paper]
Hannah E. Colmer, Charles G. Margarit, Jeremy M. Smith, Timothy A. Jackson, Joshua Telser
Eur. J. Inorg. Chem., December 23, 2015, DOI: 10.1002/ejic.201501250. Read article.

Homoleptic Two-Coordinate Silylamido Complexes of Chromium(I), Manganese(I), and Cobalt(I)

Homoleptic Two-Coordinate Silylamido Complexes of Chromium(I), Manganese(I), and Cobalt(I)

Amido magnetism: The amido N(SiMe3)2 ligand is shown to stabilise two-coordinate metal(I) complexes for Cr and Co, in a manner similar to that previously reported for the Fe analogue (see figure). In the case of Mn, a dimer with an unsupported Mn-Mn bond was isolated. Quantum chemical calculation provided an electronic and magnetic description of the Cr–Co series.

[Full Paper]
C. Gunnar Werncke, Elizaveta Suturina, Philip C. Bunting, Laure Vendier, Jeffrey R. Long, Mihail Atanasov, Frank Neese, Sylviane Sabo-Etienne, Sébastien Bontemps
Chem. Eur. J., December 18, 2015, DOI: 10.1002/chem.201503980. Read article.

Installation of a Rigid EDTA-Like Motif into a Protein α-Helix for Paramagnetic NMR Spectroscopy with Cobalt(II) Ions

Installation of a Rigid EDTA-Like Motif into a Protein α-Helix for Paramagnetic NMR Spectroscopy with Cobalt(II) Ions

Do not bend: Coupling two copies of an iminodiacetic acid–cysteine hybrid ligand to a pair of cysteine residues positioned in an i, i+4 arrangement within a protein α-helix (see figure) leads to generation of an EDTA-like metal ion-binding motif. Rigid binding of a CoII ion by this motif produces pseudo-contact shifts suitable for paramagnetic NMR structural studies.

[Communication]
James D. Swarbrick, Phuc Ung, Matthew L. Dennis, Michael D. Lee, Sandeep Chhabra, Bim Graham
Chem. Eur. J., December 17, 2015, DOI: 10.1002/chem.201503139. Read article.

Site-Resolved Two-Step Relaxation Process in an Asymmetric Dy2 Single-Molecule Magnet

Site-Resolved Two-Step Relaxation Process in an Asymmetric Dy2 Single-Molecule Magnet

One-to-one correspondence: Employing a new hydrazone ligand resulted in the self-assembly of an asymmetric Dy2 single-molecule magnet (SMM) displaying well-separated two-step relaxation with the anisotropic centers in fine-tuned local environments where the correspondence between the metal sites and the relaxation processes was evidenced (QTM=quantum tunneling of magnetization).

[Full Paper]
Li Zhang , Julie Jung, Peng Zhang, Mei Guo, Lang Zhao, Jinkui Tang, Boris Le Guennic
Chem. Eur. J., December 16, 2015, DOI: 10.1002/chem.201503422. Read article.

Liquid Nickel Salts: Synthesis, Crystal Structure Determination and Electrochemical Synthesis of Nickel Nanoparticles

Liquid Nickel Salts: Synthesis, Crystal Structure Determination and Electrochemical Synthesis of Nickel Nanoparticles

Liquid bunch: Several new liquid nickel (II) salts were synthesized, characterized by XRD and tested for the electroreduction of nickel. Nickel nanoparticles were formed at 100 % selectivity, as was characterized by TEM and SQUID measurements. A mechanism for the electrochemical synthesis of nanoparticles is proposed.

[Full Paper]
Jeroen Sniekers, Ken Verguts, Neil R. Brooks, Stijn Schaltin, Thanh Hai Phan, Thi Mien Trung Huynh, Luc Van Meervelt, Steven De Feyter, Jin Won Seo, Jan Fransaer, Koen Binnemans
Chem. Eur. J., December 8, 2015, DOI: 10.1002/chem.201504123. Read article.

An Experimental and Theoretical Investigation on Pentacoordinated Cobalt(III) Complexes with an Intermediate S=1 Spin State: How Halide Ligands Affect their Magnetic Anisotropy

An Experimental and Theoretical Investigation on Pentacoordinated Cobalt(III) Complexes with an Intermediate S=1 Spin State: How Halide Ligands Affect their Magnetic Anisotropy

Complex magnetism: The factors that control the magnitude and symmetry of the magnetic anisotropy are investigated for a unique series of halide CoIII complexes (see figure), which possess a rare intermediate S=1 spin ground state and remarkably large axial zero-field splitting.

[Full Paper]
Deborah Brazzolotto, Marcello Gennari, Shengying Yu, Jacques Pécaut, Mathieu Rouzières, Rodolphe Clérac, Maylis Orio, Carole Duboc
Chem. Eur. J., November 26, 2015, DOI: 10.1002/chem.201502997. Read article.

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