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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

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

Bioinspired 1D Superparamagnetic Magnetite Arrays with Magnetic Field Perception

Bioinspired 1D Superparamagnetic Magnetite Arrays with Magnetic Field Perception

Superparamagnetic magnetite nanoparticles can be assembled into 1D arrays by a capillary-bridge mediate assembly approach, inspired by the Earth's magnetic field perception in nature. These 1D arrays possess strict alignment, precise position and high aspect ratio, yielding highly anisotropic magnetization characteristic.

[Communication]
Xiangyu Jiang, Jiangang Feng, Lei Huang, Yuchen Wu, Bin Su, Wensheng Yang, Liqiang Mai, Lei Jiang
Adv. Mater., May 27, 2016, DOI: 10.1002/adma.201601609. Read article

Molecular Order in Buried Layers of TbPc2 Single-Molecule Magnets Detected by Torque Magnetometry

Molecular Order in Buried Layers of TbPc2 Single‐Molecule Magnets Detected by Torque Magnetometry

Cantilever torque magnetometry is used to elucidate the orientation of magnetic molecules in thin films. The technique allows depth-resolved investigations by intercalating a layer of anisotropic magnetic molecules in a film of its isotropic analogues. The proof-of-concept is here demonstrated with the single-molecule magnet TbPc2 evidencing also an exceptional long range templating effect on substrates coated by the organic molecule perylene-3,4,9,10-tetracarboxylic dianhydride.

[Communication]
Mauro Perfetti, Michele Serri, Lorenzo Poggini, Matteo Mannini, Donella Rovai, Philippe Sainctavit, Sandrine Heutz, Roberta Sessoli
Adv. Mater., May 27, 2016, DOI: 10.1002/adma.201600791. Read article

Single Capillary Electrospinning of Magnetic Core–shell Nanofibers

Single Capillary Electrospinning of Magnetic Core–shell Nanofibers

We create solid, core-shell, and hollow nanofibers via a single capillary electrospinning in combination with a controllable drying process of precursor nanofibers. The nonequilibrium inter-diffusion of solvent and solute during the controllable pre-drying process dominates the formation of hollow and core-shell nanostructures. Moreover, these CAF core-shell nanofibers were demonstrated the highest HC as compared to their solid and hollow nanofibers due to the enhanced magnetic surface anisotropy.

[Communication]
Ruie Lu, Minwei Xu, Bi Fu, Yin Zhang, Chao Zhou, Yuyang Zeng, Sen Yang, Xiaoping Song, Xuan Zhou
ChemistrySelect, May 25, 2016, DOI: 10.1002/slct.201600321. Read article

Janus Composite Nanotubes

Janus Composite Nanotubes

Inside and out: A facile method yields a novel superparamagnetic Janus nanotube with anisotropic morphology. FeOOH is introduced onto the sulfonated polydivinylbenzene (PDVB) tubes and subsequently coated with a thin layer of silica. The composite nanotubes become superparamagnetic after calcination. Selective modification of the interior and exterior surfaces yields superparamagnetic nanotubes with Janus shells. Desired species can be selectively captured into the cavity of the Janus nanotubes from their surroundings.

[Communication]
Ying Chen, Zhen Liu, Xiaozhong Qu, Fuxin Liang, Zhenzhong Yang
Chem. Asian J., May 24, 2016, DOI: 10.1002/asia.201600435. 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

Optimization of Prussian Blue Coated NaDyF4:x%Lu Nanocomposites for Multifunctional Imaging-Guided Photothermal Therapy

Optimization of Prussian Blue Coated NaDyF4:x%Lu Nanocomposites for Multifunctional Imaging‐Guided Photothermal Therapy

From the MR, CT, and PT properties of PB-coated NaDyF4:x% Lu nanocomposites with controlled size, NaDyF4:50%Lu@PB nanocomposites with good imaging properties and treatment effect are selected as the optimal materials for T1T2 dual model magnetic resonanse, computed tomography, photothermal imaging-guided photothermal therapy of tumors in small-animal model.

[Full Paper]
Yuxin Liu, Quanwei Guo, Xingjun Zhu, Wei Feng, Lu Wang, Liyi Ma, Ge Zhang, Jing Zhou, Fuyou Li
Adv. Funct. Mater., May 20, 2016, DOI: 10.1002/adfm.201601478. Read article

Magnetic Core–Shell Silica Nanoparticles with Large Radial Mesopores for siRNA Delivery

Magnetic Core–Shell Silica Nanoparticles with Large Radial Mesopores for siRNA Delivery

Magnetic core-shell large-pore mesoporous silica nanoparticles with an acid-liable coating are developed as a novel siRNA delivery vector. These nano-carriers demonstrate effective loading and protection of siRNA, enhanced cellular uptake under a magnetic field, and could be a promising platform for siRNA therapy by magnetofection.

[Full Paper]
Lin Xiong, Jingxu Bi, Youhong Tang, Shi-Zhang Qiao
Small, May 19, 2016, DOI: 10.1002/smll.201600531. Read article

A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

Superstable biskyrmion magnetic nanodomains are experimentally observed for the first time in a hexagonal MnNiGa, a common and easily produced centrosymmetric material. The biskyrmion states in MnNiGa thin plates, as determined by the combination of in situ Lorentz transmission electron microscopy images, magnetoresistivity, and topological Hall effect measurements, are surprisingly stable over a broad temperature range of 100–340 K.

[Communication]
Wenhong Wang, Ying Zhang, Guizhou Xu, Licong Peng, Bei Ding, Yue Wang, Zhipeng Hou, Xiaoming Zhang, Xiyang Li, Enke Liu, Shouguo Wang, Jianwang Cai, Fangwei Wang, Jianqi Li, Fengxia Hu, Guangheng Wu, Baogen Shen, Xi-Xiang Zhang
Adv. Mater., May 18, 2016, DOI: 10.1002/adma.201600889. Read article

High-Resolution Vertical Observation of Intracellular Structure Using Magnetically Responsive Microplates

High‐Resolution Vertical Observation of Intracellular Structure Using Magnetically Responsive Microplates

A vertical confocal observation system capable of high-resolution observation of intracellular structure is demonstrated. The system consists of magnet-active microplates to rotate, incline, and translate single adherent cells in the applied magnetic field. Appended to conventional confocal microscopes, this system enables high-resolution cross-sectional imaging with single-molecule sensitivity in single scanning.

[Communication]
Tetsuhiko Teshima, Hiroaki Onoe, Soichiro Tottori, Hiroka Aonuma, Takeomi Mizutani, Koki Kamiya, Hirotaka Ishihara, Hirotaka Kanuka, Shoji Takeuchi
Small, May 17, 2016, DOI: 10.1002/smll.201600339. Read article

Deep Photoacoustic/Luminescence/Magnetic Resonance Multimodal Imaging in Living Subjects Using High-Efficiency Upconversion Nanocomposites

Deep Photoacoustic/Luminescence/Magnetic Resonance Multimodal Imaging in Living Subjects Using High‐Efficiency Upconversion Nanocomposites

A gadolinium-doped multi-shell upconversion nanoparticle under 800 nm excitation is synthesized with a 10-fold fluorescence-intensity enhancement over that under 980 nm. The nanoformulations exhibit excellent photoacoustic/luminescence/magnetic resonance tri-modal imaging capabilities, enabling visualization of tumor morphology and microvessel distribution at new imaging depth.

[Communication]
Yu Liu, Ning Kang, Jing Lv, Zijian Zhou, Qingliang Zhao, Lingceng Ma, Zhong Chen, Lei Ren, Liming Nie
Adv. Mater., May 17, 2016, DOI: 10.1002/adma.201506460. 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

Synthesis, Structure, and Properties of the Fullerene C60 Salt of Crystal Violet, (CV+)(C60.−)⋅0.5 C6H4Cl2, which Contained Closely Packed Zigzagged C60.− Chains

Synthesis, Structure, and Properties of the Fullerene C60 Salt of Crystal Violet, (CV+)(C60.−)⋅0.5 C6H4Cl2, which Contained Closely Packed Zigzagged C60.− Chains

Fullerene salt with crystal violet: Crystals of the fullerene salt of crystal violet (CV) cations, (CV+)(C60.−)0.5 C6H4Cl2 (1), contained closely packed zigzagged C60.− chains without dimerization of C60.−. This structure gave the salt semiconducting properties and antiferromagnetic spin coupling in the chains with a Weiss temperature of −19 K.

[Full Paper]
Dmitri V. Konarev, Alexey V. Kuzmin, Salavat S. Khasanov, Manabu Ishikawa, Akihiro Otsuka, Hideki Yamochi, Gunzi Saito, Rimma N. Lyubovskaya
Chem. Asian J., May 11, 2016, DOI: 10.1002/asia.201600242. Read article

Interpretation of Spectroscopic Markers of Hydrogen Bonds

Interpretation of Spectroscopic Markers of Hydrogen Bonds

NMR chemical shielding can be caused simply by proximity to a hydrogen-bond acceptor, in absence of a proton donor.

[Article]
Steve Scheiner
ChemPhysChem, May 09, 2016, DOI: 10.1002/cphc.201600326. 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

External Magnetic Field-Induced Targeted Delivery of Highly Sensitive Iron Oxide Nanocubes for MRI of Myocardial Infarction

External Magnetic Field‐Induced Targeted Delivery of Highly Sensitive Iron Oxide Nanocubes for MRI of Myocardial Infarction

Magnetic field responsive nanocubes (MFRFs) are synthesized as nanoplatforms for external magnetic field-induced selective targeting of macrophages in the infarcted tissue and magnetic resonance imaging (MRI) monitoring. MFRFs have uniform size, favorable colloidal stability, and high magnetic properties. Under the influence of external magnetic field, MFRFs perform qualitative and quantitative MRI of myocardial infarction.

[Communication]
Bingbing Hu, Mu Zeng, Jingli Chen, Zhenzhong Zhang, Xiaoning Zhang, Zhanming Fan, Xin Zhang
Small, May 04, 2016, DOI: 10.1002/smll.201600263. Read article

Structure and magnetic properties of 2p-3d-4f hetero-tri-spin chains consisting [Cu(hfac)2-radical]2 dimer and Ln(hfac)3

A new family of 2p-3d-4f hetero-tri-spin complexes {Ln(hfac)3[Cu(hfac)2(NIT-3PyPh)]2} (Ln = Gd (1), Tb (2), Dy (3), Ho (4); NIT-3PyPh = 2-(4-(3-pyridinylmethoxy)phenyl)-4,4,5,5-tetramethylimidazolyl-1-oxyl-3-oxide; hfac = hexafluoroacetylacetonate) have been achieved. Four complexes possess 1-D chain structure in which two radical ligands join two Cu(hfac)2 molecules to forma [Cu(hfac)2-rad)]2 dimer cycle and the dimer rings are linked by Ln(hfac)3 units. Magnetic studies show that there exist ferromagnetic exchange couplings between the coordinated NO groups of radical ligands and metal ions. Field-induced slow relaxation of the magnetization was observed in Tb and Dy compounds.

[Full Paper]
Mei Zhu, Meng Yang, Juanjuan Wang, Hongdao Li, Licun Li
Chem. Asian J., May 04, 2016, DOI: 10.1002/asia.201600383. Read article

Microfabrication of FeMnPt films involving magnetic phase change due to structural transformation caused by ion irradiation

Microfabrication of FeMnPt films involving magnetic phase change due to structural transformation caused by ion irradiation

Mn ions are irradiated onto an L 10 FeMnPt film having ferromagnetic properties with high magnetic anisotropy, through microfabricated resist masks. Only the magnetic properties of the irradiated areas change from ferromagnetic to paramagnetic due to structural transformation. The results indicate that this method can be applied to the microfabrication of high-density, nanometer-scale magnetic storage devices.

[Rapid Research Letter]
Takashi Hasegawa, Ryosuke Kasahara, Kaori Sasaki, Shunji Ishio
Phys. Status Solidi RRL, April 29, 2016, DOI: 10.1002/pssr.201600031. Read article

Immobilization of Cellulase on Magnetic Nanocarriers

Immobilization of Cellulase on Magnetic Nanocarriers

Small particles, great potential: Magnetic nanoscale carrier materials can reduce negative mass-transfer effects and thus facilitate high enzymatic activity in the hydrolysis and degradation of highly molecular cellulose to single reducing sugars, such as glucose. We immobilized cellulase on bare and silica-coated magnetite nanoparticles and were able to achieve high loadings and no loss in activity over ten process cycles.

[Communication]
Hans-Christian Roth, Sebastian P. Schwaminger, Fei Peng, Sonja Berensmeier
ChemistryOpen, April 29, 2016, DOI: 10.1002/open.201600028. 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.

Probing Dy3+ magnetic moments in multiferroic perovskite DyMnO3 by optical spectroscopy

Probing Dy3+ magnetic moments in multiferroic perovskite DyMnO3 by optical spectroscopy

This Letter presents experimental data on the temperature-dependent splitting of the Dy3+ ground Kramers doublet in multiferroic DyMnO3, inherently related to the dysprosium magnetic moment in the ordered state. The authors argue that the Dy–Mn interaction is of the Dzyaloshinskii–Moriya type.

[Rapid Research Letter]
M. A. Kashchenko, S. A. Klimin, A. M. Balbashov, M. N. Popova
Phys. Status Solidi RRL, April 27, 2016, DOI: 10.1002/pssr.201600076. 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.

Magnetic ordering in Ho-doped Bi2Te3 topological insulator

Magnetic ordering in Ho‐doped Bi2Te3 topological insulator

The authors report the experimental discovery of an antiferromagnetic topological insulator thin film system. They have recently successfully synthesized high quality Ho-doped Bi2Te3 thin films by molecular beam epitaxy and found paramagnetic bulk behavior of the film. Here, they present a surface-sensitive X-ray magnetic circular dichroism study at lower temperatures. At temperatures below ∼25 K they found a departure from the Curie law, pointing towards the existence of antiferromagnetic ordering.

[Rapid Research Letter]
A. I. Figueroa, S. E. Harrison, L. J. Collins-McIntyre, G. van der Laan, T. Hesjedal
Phys. Status Solidi RRL, April 14, 2016, DOI: 10.1002/pssr.201600061. Read article

A Set of Efficient nD NMR Protocols for Resonance Assignments of Intrinsically Disordered Proteins

A Set of Efficient nD NMR Protocols for Resonance Assignments of Intrinsically Disordered Proteins

The RF pulse scheme RN[N-CA HEHAHA]NH, which provides a convenient approach to the acquisition of different multidimensional chemical shift correlation NMR spectra leading to backbone resonance assignments, including those of the proline residues of intrinsically disordered proteins, is experimentally demonstrated.

[Communication]
Christoph Wiedemann, Peter Bellstedt, Sabine Häfner, Christian Herbst, Frank Bordusa, Matthias Görlach, Oliver Ohlenschläger, Ramadurai Ramachandran
ChemPhysChem, April 09, 2016, DOI: 10.1002/cphc.201600155. 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

A Closed Chondromimetic Environment within Magnetic-Responsive Liquified Capsules Encapsulating Stem Cells and Collagen II/TGF-β3 Microparticles

A Closed Chondromimetic Environment within Magnetic‐Responsive Liquified Capsules Encapsulating Stem Cells and Collagen II/TGF‐β3 Microparticles

Multilayered and liquified magnetic capsules encapsulating microparticles and stem cells are proposed as an injectable and self-regulated system to regenerate cartilage. The microparticle's surface is modified with TGF-β3 cross-linked to collagen II. Within the closed 3D chondromimetic environment, encapsulated stem cells are expected to differentiate toward the chondrogenic lineage and maintain their phenotype without growth factor supplementation.

[Full Paper]
Clara R. Correia, Sara Gil, Rui L. Reis, João F. Mano
Adv. Healthcare Mater., March 18, 2016, DOI: 10.1002/adhm.201600034. 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

Rational Design of Dual Active Sites in a Single Protein Scaffold: A Case Study of Heme Protein in Myoglobin

Rational Design of Dual Active Sites in a Single Protein Scaffold: A Case Study of Heme Protein in Myoglobin

A body with two hearts! Rational protein design is a powerful tool for creating functional artificial proteins, particularly those with multiple active sites. In this study, dual active sites in a single heme protein scaffold, myoglobin, were rationally designed by retaining the native heme site and creating a copper-binding site remotely through a single mutation, with both sites exhibiting nitrite reductase activity by reduction of nitrite to nitric oxide.

[Communication]
Xiao-Gang Shu, Ji-Hu Su, Ke-Jie Du, Yong You, Shu-Qin Gao, Ge-Bo Wen, Xiangshi Tan, Ying-Wu Lin
ChemistryOpen, March 08, 2016, DOI: 10.1002/open.201500224. 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.

© Wiley-VCH 2015.