Journal ArticleDOI
Designer magnets containing cyanides and nitriles.
Joel S. Miller,Jamie L. Manson +1 more
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Three-dimensional network solids exhibiting magnetic ordering have been made from several first-row metal ions and bridging unsaturated cyanide, tricyanomethanide, and/or dicyanamide ligands, which possess several different structural motifs, and the shorter the bridge, the stronger the interaction.Abstract:
Magnets synthesized from molecules have contributed to the renaissance in the study of magnetic materials. Three-dimensional network solids exhibiting magnetic ordering have been made from several first-row metal ions and bridging unsaturated cyanide, tricyanomethanide, and/or dicyanamide ligands. These materials possess several different structural motifs, and the shorter the bridge, the stronger the interaction (i.e., C⋮N > N⋮CN ≫ N⋮CNC⋮N = N⋮CCC⋮N). Cyanide additionally has the ability to discriminate between C- and N-bonding to form ordered heterobimetallic magnets, and the strong coupling can lead to ferro- or ferrimagnetic ordering substantially above room temperature. Tricoordination of tricyanomethanide results in spin-frustrated systems, which possess interpenetrating rutile-like networks. In contrast, single rutile-like frameworks are formed by μ3-bonded dicyanamide, which leads to ferromagnetics and weak ferromagnetics.read more
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Synthesis, Crystal Structures, and Magnetism of Cobalt Coordination Polymers Based on Dicyanamide and Pyrazine-dioxide Derivatives
TL;DR: Three coordination polymers of Co(II) with dicyanamide (dca) were obtained by adding coligands of 2,5-dimethylpyrazine-dioxide (2,3-dmpdo) or 2,3,5,6-tetramethylpyazine-Dioxide (3) to the binary system of Co-dca, which displays antiferromagnetic ordering below 10.8 K.
Journal ArticleDOI
Two 3D Triazolate―Tricarboxylate-Bridged CuII/I Frameworks by One-Pot Hydrothermal Synthesis Exhibiting Spin-Canted Antiferromagnetism and Strong Antiferromagnetic Couplings
TL;DR: Two 3D coordination polymers with the same components but different structures, obtained together by a one-pot hydrothermal reaction of Cu(OAc)(2), are observed, displaying a 3,6-connected topological network and spin-canted antiferromagnetism and overall strong antiferromeagnetic couplings up to -147.1 cm(-1).
Journal ArticleDOI
TEMPO in Chemical Transformations: From Homogeneous to Heterogeneous
TL;DR: The TEMPO (2,2,6,6-tetramethylpiperidine-Noxyl) radical is an organic radical that finds a variety of industrial applications for chemical transformations.
Journal ArticleDOI
Chemoselective Schmidt Reaction Mediated by Triflic Acid: Selective Synthesis of Nitriles from Aldehydes
TL;DR: The reaction of aldehydes with NaN(3) and TfOH furnishes the corresponding nitriles in near quantitative yields and tolerates a variety of electron-withdrawing and electron-donating substituents on the substrates.
Journal ArticleDOI
Copper-catalyzed aerobic oxidative synthesis of aryl nitriles from benzylic alcohols and aqueous ammonia
TL;DR: Copper-catalyzed direct conversion of benzylic alcohols to aryl nitriles was realized using NH3(aq.) as the nitrogen source, O2 as the oxidant and TEMPO as the co-catalyst.
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B. F. Hoskins,Richard Robson +1 more
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A room-temperature organometallic magnet based on Prussian blue
TL;DR: In this paper, a room-temperature organometallic magnet was synthesized by combining a hexa-cyanometalate [M(CN)6]q− with a Lewis acid Lp+.
Journal ArticleDOI
Strongly Geometrically Frustrated Magnets
TL;DR: The study of cooperative phenomena in magnetism has provided fertile ground for testing theories of interacting systems that possess different spatial dimensions, ranges, and sign of interactions, and that exhibit local anisotropy of the basic interacting unit, the magnetic spin this paper.
Journal ArticleDOI
Sol−Gel Synthesis of KVII[CrIII(CN)6]·2H2O: A Crystalline Molecule-Based Magnet with a Magnetic Ordering Temperature above 100 °C
TL;DR: In this paper, the use of sol-gel methods was described to synthesize several crystalline molecule-based magnets with the Prussian blue structure, including KV II[CrIII (CN)6]‚2H2O, with an ordering temperature of 376 K (103°C).