Hot TopicsWiley-VCH

AMCPHCChem Eur JAngewandte

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.

RSS feed

Recent Articles

One-pot Preparation of Hierarchical Nanosheet-Constructed Fe3O4/MIL-88B(Fe) Magnetic Microspheres with High Efficiency Photocatalytic Degradation of Dye

[Full Paper]
Zhaokui Jin, Wenjun Dong, Mu Yang, Jingjing Wang, Hongyi Gao, Ge Wang
ChemCatChem, August 29, 2016, DOI: 10.1002/cctc.201600952. Read article

Prediction of Protein Structure Using Surface Accessibility Data

Prediction of Protein Structure Using Surface Accessibility Data

Protein structures can be predicted by using surface accessibility data from NMR paramagnetic relaxation enhancements by a soluble paramagnetic compound (sPRE). This method exploits the distance-to-surface information encoded in the sPRE data in the chemical shift-based CS-Rosetta de novo structure prediction framework to generate reliable structural models.

[Communication]
Christoph Hartlmüller, Christoph Göbl, Tobias Madl
Angew. Chem. Int. Ed., August 25, 2016, DOI: 10.1002/anie.201604788. Read article

Magnetically Alignable Bicelles with Unprecedented Stability Using Tunable Surfactants Derived from Cholic Acid

Five novel surfactants were prepared by modifying the three hydroxy groups of sodium cholate with triethylene glycol chains endcapped with an amide (SC-C1, SC-nC4, and SC-nC5) or a carbamoyl group (SC-OnC4 and SC-OtC4).The phase behavior of aqueous mixtures of these surfactants with 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine (DMPC) was systematically studied by 31P NMR spectroscopy.The surfactants endcapped with carbamate groups (SC-OnC4 and SC-OtC4) formed magnetically alignable bicelles over unprecedentedly wide ranges of conditions, in terms of temperature (from 21-23 to >90 °C), lipid/surfactant ratio (from 5 to 8), total lipid content (5-20 wt%), and lipid type [DMPC, 1,2-dilauroyl-sn-glycero-3-phosphatidylcholine (DLPC), or 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine (POPC)].In conjunction with appropriate phospholipids, the carbamate-endcapped surfactants afforded unique bicelles, characterized by exceptional thermal stabilities (from 0 to >90 °C), biomimetic lipid compositions (DMPC/POPC = 25:75 to 50:50), and extremely large 2H quadrupole splittings (up to 71 Hz).

[Article]
Ryoichi Matsui, Noriyuki Uchida, Masataka Ohtani, Kuniyo Yamada, Arisu Shigeta, Izuru Kawamura, Takuzo Aida, Yasuhiro Ishida
ChemPhysChem, August 24, 2016, DOI: 10.1002/cphc.201600897. Read article

Multimetal-Substituted Epsilon-Iron Oxide ϵ-Ga0.31Ti0.05Co0.05Fe1.59O3 for Next-Generation Magnetic Recording Tape in the Big-Data Era

Multimetal‐Substituted Epsilon‐Iron Oxide ϵ‐Ga0.31Ti0.05Co0.05Fe1.59O3 for Next‐Generation Magnetic Recording Tape in the Big‐Data Era

For the record: A new series of metal-substituted ϵ-Fe2O3 nanoparticles, ϵ-GaIII0.31TiIV0.05CoII0.05FeIII1.59O3, with an average size of 18 nm was prepared. The Ga, Ti, and Co cations tune the magnetic properties of ϵ-Fe2O3 to the specifications demanded for a magnetic recording tape. The fabricated magnetic tape showed a remarkably high signal-to-noise ratio. This series of materials should be applicable for data storage in the big-data era.

[Communication]
Shin-ichi Ohkoshi, Asuka Namai, Marie Yoshikiyo, Kenta Imoto, Kazunori Tamazaki, Koji Matsuno, Osamu Inoue, Tsutomu Ide, Kenji Masada, Masahiro Goto, Takashi Goto, Takayuki Yoshida, Tatsuro Miyazaki
Angew. Chem. Int. Ed., August 24, 2016, DOI: 10.1002/anie.201604647. Read article

Magnetically assembled SERS substrates made of Fe-Ag nanoparticles obtained by laser ablation in ethanol

The widespread application of surface enhanced Raman scattering (SERS) would benefit of simple and scalable self-assembly procedures for the realization of plasmonic arrays with high density of electromagnetic hot-spots. To this purpose, here we describe the exploitation of iron-doped silver nanoparticles (NPs) synthesized by laser ablation of a bulk bimetallic Fe-Ag target immersed in ethanol. The use of laser ablation in liquid was key to achieve in one step bimetallic NPs with clean surface available to functionalization with the desired thiolated molecules. These Fe-Ag NPs show SERS performances, ready response to external magnetic fields and complete flexibility in surface coating. All these characteristics were used for the magnetic assembly of plasmonic arrays which served as SERS substrates for the identification of molecules of analytical interest. The magnetic assembly of NPs allowed the 28-fold increase in the SERS signal of analytes compared to not-assembled NPs. The versatility of substrate preparation and the SERS performances were investigated as a function of NPs surface coating among different thiolated ligands. These results show a simple procedure to obtain magnetically assembled regenerable plasmonic arrays for repeated SERS investigation of different samples, and it can be of inspiration for the realization of other self-assembled and reconfigurable magnetic-plasmonic devices.

[Article]
Stefano Scaramuzza, Denis Badocco, Paolo Pastore, Diego F. Coral, Marcela B. Fernández Van Raap, Vincenzo Amendola
ChemPhysChem, August 23, 2016, DOI: 10.1002/cphc.201600651. Read article

Layered Antiferromagnetic Ordering in the Most Active Perovskite Catalysts for the Oxygen Evolution Reaction

Layered Antiferromagnetic Ordering in the Most Active Perovskite Catalysts for the Oxygen Evolution Reaction

Lining up for reaction: An in-depth ab initio study of the magnetic structure within the most active perovskites for the oxygen evolution reaction is presented. In all cases, the ground state exhibits an extended antiferromagnetic coupling in the unit cell. Layered antiparallel alignment of the magnetic moments appears to be related to their electrocatalytic activity.

[Full Paper]
Tingbin Lim, J. W. (Hans) Niemantsverdriet, Jose Gracia
ChemCatChem, August 23, 2016, DOI: 10.1002/cctc.201600611. Read article

The Preparation of Compressible and Fire-Resistant Sponge-Supported Reduced Graphene Oxide Aerogel for Electromagnetic Interference Shielding

We here report a facile method to fabricate sponge-supported reduced graphene oxide aerogel (S-RGOA) using commercial melamine sponge and graphene oxide (GO). Firstly, GO sheets were self-assembled within the melamine sponge by the assistance of chemical cross-linking agent; and then, freezing-drying and thermal treatment were adopted to prepare S-RGOA, in which continuous porous reduced graphene oxide (RGO) network formed between the skeleton. The resulting S-RGOA exhibits a high electromagnetic interference shielding effectiveness (EMI SE) of 20.4-27.3 dB in 8-12 GHz and the specific EMI SE could reach 1437 dB*cm3/g. Mechanical test suggests that the lightweight S-RGOA is compressible and possesses low energy dissipation. Burning and TGA measurements indicate that S-RGOA is fire-resistant and has excellent thermal stability. Our work provides an economical and environmentally friendly method to fabricate RGO aerogels for using as electromagnetic interference materials.

[Full Paper]
Changzhen Liu, Shibing Ye, Jiachun Feng
Chem. Asian J., August 18, 2016, DOI: 10.1002/asia.201600905. Read article

Magnetic Field Effect in Organic Light-Emitting Diodes Based on Electron Donor–Acceptor Exciplex Chromophores Doped with Fluorescent Emitters

Magnetic Field Effect in Organic Light‐Emitting Diodes Based on Electron Donor–Acceptor Exciplex Chromophores Doped with Fluorescent Emitters

Using magneto-electroluminesence in organic light-emitting diodes of donor–acceptor exciplex compounds doped with fluorescence emitters, we found that the activation energy of the reversed intersystem crossing process is substantially reduced compared with that of the undoped compound. At lower dopant concentration, the rapid Förster energy transfer enhances the electro-luminesence, whereas at higher dopant concentration Dexter energy transfer interferes, creating a loss mechanism.

[Full Paper]
Sangita Baniya, Zhiyong Pang, Dali Sun, Yaxin Zhai, Ohyun Kwon, Hyeonho Choi, Byoungki Choi, Sangyoon Lee, Z. Valy Vardeny
Adv. Funct. Mater., August 18, 2016, DOI: 10.1002/adfm.201601669. Read article

Magnetite-binding flagellar filaments displaying the MamI loop motif

This work aims at developing a novel method for fabricating 1D magnetite nanostructures with the help of mutagenized flagellar filaments. We constructed four different flagellin mutants displaying magnetite-binding motifs. Two of the mutants contained fragments of magnetosome-associated proteins from magnetotactic bacteria (MamI and Mms6), whereas for the other two mutants synthetic sequences were used. A magnetic selection procedure identified the mutant incorporating the loop segment from MamI to have the highest binding affinity towards magnetite. Filaments built from MamI loop-containing flagellin subunits were used as templates to form chains of magnetite nanoparticles along the filament by capturing them from suspension. Our study presents a proof of concept that flagellar filaments can be engineered to facilitite formation of 1D magnetite nanostructures under ambient conditions. In addition, it proves the interaction between MamI and magnetite, with implications for the role of the protein in magnetotactic bacteria.

[Full Paper]
Éva Bereczk-Tompa, Mihály Pósfai, Balázs Tóth, Ferenc Vonderviszt
ChemBioChem, August 16, 2016, DOI: 10.1002/cbic.201600377. Read article

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

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

Dressed for success: The development and photophysical behavior of a magneto-ESIPT (excited-state intramolecular proton transfer) fluorescent core–shell nanoparticle featuring an advantageous large Stoke shift and potential use for multimodal imaging (magnetic resonance and optical imaging) is reported. When grafted onto silica-coated iron oxide nanoparticles, the emission of the keto tautomer of the ESIPT dye (which is otherwise quenched in the presence of bare iron oxide) is preserved.

[Communication]
Elisa M. N. de Oliveira, Felipe L. Coelho, Mara L. Zanini, Ricardo M. Papaléo, Leandra F. Campo
ChemPhysChem, August 12, 2016, DOI: 10.1002/cphc.201600472. Read article

Self-Assembled Magnetite Mesocrystalline Films: Toward Structural Evolution from 2D to 3D Superlattices

Self‐Assembled Magnetite Mesocrystalline Films: Toward Structural Evolution from 2D to 3D Superlattices

Orientational relations in 2D and 3D mesocrystalline films produced by self-assembly of iron oxide (magnetite) truncated nanocubes and their transition are described. Atomistic models for a detailed structure description of the mesocrystals are introduced. The most efficient space filling within the 3D superstructure is achieved by changing the nanoparticle orientational order following the “bump-to-hollow” packing principle.

[Full Paper]
J. Brunner, I. A. Baburin, S. Sturm, K. Kvashnina, A. Rossberg, T. Pietsch, S. Andreev, E. Sturm (née Rosseeva), H. Cölfen
Adv. Mater. Interfaces, August 11, 2016, DOI: 10.1002/admi.201600431. Read article

Inorganic/Organic Multilayer Capsule Composition for Improved Functionality and External Triggering

Inorganic/Organic Multilayer Capsule Composition for Improved Functionality and External Triggering

This progress report describes novel methods in synthesis of inorganic/organic multilayer capsules using sol–gel approach. The unique physicochemical properties of polymers and inorganic nanoparticles used in layer-by-layer synthesis make composite microcapsules promising in various fields, such as storage, catalysis, cells imaging, controlled drug release, and targeted drug delivery. With particular focus on SiO2 and TiO2 coating the capsules' response to remote physical signaling such as ultrasound and light is discussed in outlook for their applications.

[Progress Report]
Alexander S. Timin, Hui Gao, Denis V. Voronin, Dmitry A. Gorin, Gleb B. Sukhorukov
Adv. Mater. Interfaces, August 11, 2016, DOI: 10.1002/admi.201600338. Read article

Electronic Transitions in Conformationally Controlled Peralkylated Hexasilanes

Electronic Transitions in Conformationally Controlled Peralkylated Hexasilanes

Simultaneous fitting of UV, magnetic circular dichroism (MCD), and linear dichroism (LD) spectra with Gaussians permits individual transitions in a hexasilane to be discerned and compared with symmetry-adapted-cluster configuration interaction (SAC-CI) calculations, which account for their dramatic conformational dependence.

[Article]
Yuki Kanazawa, Hayato Tsuji, Masahiro Ehara, Ryoichi Fukuda, Deborah L. Casher, Kohei Tamao, Hiroshi Nakatsuji, Josef Michl
ChemPhysChem, August 09, 2016, DOI: 10.1002/cphc.201600633. Read article

A Multifunctional Biomaterial with NIR Long Persistent Phosphorescence, Photothermal Response and Magnetism

A Multifunctional Biomaterial with NIR Long Persistent Phosphorescence, Photothermal Response and Magnetism

Multifunctional phosphors Zn3Ga2SnO8: Cr3+, Nd3+, Gd3+ with persistent NIR phosphorescence, photothermal response, and magnetism have been fabricated. These materials can act as NIR optical biolabels and magnetic resonance imaging (MRI) contrast agents for tracking early cancer cells, and also as a photothermal therapeutic agent for killing cancer cells.

[Full Paper]
Yiling Wu, Yang Li, Xixi Qin, Jianrong Qiu
Chem. Asian J., August 05, 2016, DOI: 10.1002/asia.201600569. Read article

Quantitative Resolution of Monomer-Dimer Populations by Inversion Modulated DEER EPR Spectroscopy

Quantitative Resolution of Monomer‐Dimer Populations by Inversion Modulated DEER EPR Spectroscopy

DEER in the headlights: Analysis of modulation depth for a double electron–electron resonance dipolar evolution curve as a function of electron double resonance (ELDOR) pulse flip angle is an effective and reliable electron paramagnetic resonance (EPR) method for resolving monomer/dimer populations in a frozen glass. The technique is demonstrated using the p66 subunit of HIV-1 reverse transcriptase where dimerization is modulated by glycerol, a universal cryo-protectant widely used in EPR spectroscopy.

[Communication]
Thomas Schmidt, Rodolfo Ghirlando, James Baber, G. Marius Clore
ChemPhysChem, August 02, 2016, DOI: 10.1002/cphc.201600726. Read article

Limits in Proton Nuclear Singlet-State Lifetimes Measured with para-Hydrogen-Induced Polarization

Limits in Proton Nuclear Singlet‐State Lifetimes Measured with para‐Hydrogen‐Induced Polarization

Single for a lifetime: Polarization and the singlet state are preserved over two controlled chemical steps to create long-lived proton singlet states. Owing to the high symmetry, the singlet-state readout requires either a chemical desymmetrization or a long and repeated spin lock.

[Communication]
Yuning Zhang, Xueyou Duan, Pei Che Soon, Vladimír Sychrovský, James W. Canary, Alexej Jerschow
ChemPhysChem, July 27, 2016, DOI: 10.1002/cphc.201600663. Read article

Syntheses, Crystal Structure and Magnetic Properties of an Unprecedented One-Dimensional Coordination Polymer Derived from an {(NiL)2Ln} Node and a Pyrazine Spacer (H2L=N,N′-Bis(salicylidene)-1,3-propanediamine, Ln=Gd, Tb and Dy)

Syntheses, Crystal Structure and Magnetic Properties of an Unprecedented One‐Dimensional Coordination Polymer Derived from an {(NiL)2Ln} Node and a Pyrazine Spacer (H2L=N,N′‐Bis(salicylidene)‐1,3‐propanediamine, Ln=Gd, Tb and Dy)

Rationally designed connectivity between bimetallic trinuclear nodes has been made from transoid-[(NiIIL)2LnIII]3+ tecton (Ln=Gd, Tb, Dy) and pyrazine spacer which form tailored 1D-zigzag coordination polymer. The Gd−Ni ferromagnetic coupling is confirmed. The Ni2Dy compound shows characteristic of SMMs or polymeric aggregates of SMMs under an applied dc field.

[Full Paper]
Soumavo Ghosh, Prithwish Mahapatra, Takuya Kanetomo, Michael G. B. Drew, Takayuki Ishida, Ashutosh Ghosh
ChemistrySelect, July 22, 2016, DOI: 10.1002/slct.201600637. Read article

Use of Nuclear Spin Noise Spectroscopy to Monitor Slow Magnetization Buildup at Millikelvin Temperatures

Use of Nuclear Spin Noise Spectroscopy to Monitor Slow Magnetization Buildup at Millikelvin Temperatures

Noisy recovery: At ultralow temperatures, longitudinal nuclear magnetic relaxation times become exceedingly long and spectral lines are very broad. Nuclear spin noise spectroscopy is used to monitor proton spin polarization recovery to thermal equilibrium of a mixture of glycerol, water, and copper oxide nanoparticles. Relaxation times determined in this way are essentially free from perturbations (see figure).

[Article]
Maria Theresia Pöschko, David Peat, John Owers-Bradley, Norbert Müller
ChemPhysChem, July 22, 2016, DOI: 10.1002/cphc.201600323. 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

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

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.

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.