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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Cyano-borrowing reaction: nickel-catalyzed direct conversion of cyanohydrins and aldehydes/ketones to β-cyano ketone.
TL;DR: A direct nickel-catalyzed, high atom- and step-economical reaction of cyanohydrins with aldehydes or ketones via an unprecedented “cyano-borrowing reaction” has been developed.
Journal ArticleDOI
Bimetallic sandwiches assembled with chelated Cu/Zn cations and manganese dicyanamide polymeric ladders
TL;DR: In this paper, two isomorphous bimetallic polymeric transition metal dicyanamides [Cu(OAc)(bpy)2][Mn(dca)3(H2O)] (1) and [Zn[OAc]-mcl chains were synthesized and characterized, each consisting of Mn-dca ladder chain anions and chelated cations of the other metal, Cu or Zn.
Journal ArticleDOI
Metal dicyanamide layered coordination polymers with cyanopyridine co-ligands: Synthesis, crystal structures and magnetism
TL;DR: A series of metal dicyanamide (dca) coordination polymers combined with cyanopyridine (cypy) terminal co-ligands, namely, [Co{sub 2}(dca){sub 4}(4-cypy)] {sub n} (1), [Cd{sub 1,5}-dca linkers [sub n] (2), [Fe{sup 2} and Fe{sup II]-clique polymers are synthesized at the ambient conditions as mentioned in this paper.
Journal ArticleDOI
Neutron scattering of advanced magnetic materials
S. M. Yusuf,Amit Kumar +1 more
TL;DR: An overview of notable contributions of neutron scattering in the advancement of magnetic materials has been presented in this article, where a brief description of static neutron scattering techniques, viz., diffraction, depolarization, small angle scattering, and reflectivity, employed in the studies of advanced magnetic materials, is given.
Journal ArticleDOI
Organic- and molecule-based magnets
TL;DR: The discovery of organic-and molecule-based magnets has led to design and synthesis of several families with magnetic ordering temperatures as high as ∼125°C as discussed by the authors, including soft and hard magnet types with coercivities up to 27 kOe.
References
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Design and construction of a new class of scaffolding-like materials comprising infinite polymeric frameworks of 3D-linked molecular rods. A reappraisal of the zinc cyanide and cadmium cyanide structures and the synthesis and structure of the diamond-related frameworks [N(CH3)4][CuIZnII(CN)4] and CuI[4,4',4'',4'''-tetracyanotetraphenylmethane]BF4.xC6H5NO2
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+.
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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.
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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).