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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Structure and magnetism of coordination polymers containing dicyanamide and tricyanomethanide
TL;DR: In this paper, a review of the physical measurements made on the α-M(dca)2 series is given, together with interpretations for the different net exchange coupling and consequent 3D order.
Journal ArticleDOI
Framework-structured weak ferromagnets
TL;DR: This critical review provides an overview of the various framework-structured weak ferromagnets based on different grades of ligands (from mono-atom to three-atom-like ligands) and the relationships between structural features and the properties, rational employment of the ligands, andWeak ferromagnetic strategies for molecule-based magnets with exciting properties and applications.
Journal ArticleDOI
Recent Advances in α-Alkylation Reactions using Alcohols with Hydrogen Borrowing Methodologies
TL;DR: A review of recent advances in α-alkylation reactions based on hydrogen borrowing methodologies using alcohol as an alkylating agent is provided in this article, with a focus on highly practical and green chemistry approaches involving modified catalytic systems, including metal-supported heterogeneous catalysts and nanoparticle-based catalysts.
Journal ArticleDOI
Magnetically ordered molecule-based materials
TL;DR: These magnetically ordered materials are reviewed from a perspective of the structural dimensionality after a discussion of the important aspects of magnetism pertaining to molecule-based magnets, including the determination of the magnetic ordering temperature (T(c).
Journal ArticleDOI
N,N-dimethylformamide: a multipurpose building block.
TL;DR: Recent developments in the employment of DMF in the fields of formylation, aminocarbonylation, amination, amidation, and cyanation, as well as its reaction with arynes are summarized.
References
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High-Tc molecular-based magnets : a ferromagnetic bimetallic chromium(III)-nickel(II) cyanide with Tc = 90 K
TL;DR: The synthesis of molecular-based ferromagnetic materials was investigated in this article, where special attention was given to the T{sub c} value and its relation to the stoichiometry and water content.
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Enhancement of the magnetic ordering temperature and air stability of a mixed valent vanadium hexacyanochromate(iii) magnet to 99 c (372 k)
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Organometallic- and organic-based magnets: New chemistry and new materials for the new millennium
TL;DR: In this paper, the authors highlight the collective joint research executed in our, as well as Arthur J. Epstein's, laboratories and highlight the magnetic properties of bulk magnetism, including saturation magnetizations exceeding that of iron metal on an Fe or mole basis.
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Structure and Magnetic Ordering of MII[N(CN)2]2 (M = Co, Ni)†
Jamie L. Manson,Carmen R. Kmety,Qingzhen Huang,Jeffrey W. Lynn,Goetz M. Bendele,Silvina Pagola,Peter W. Stephens,Louise M. Liable-Sands,Arnold L. Rheingold,Arthur J. Epstein,Joel S. Miller +10 more
TL;DR: The reaction of [MII(OH2)6]-NO3)2 (M = Co, Ni) and [N(CN)2]- leads to formation of isomorphous M[N[CN]2]2 [M =Co (2a), Ni (3)], respectively.
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(μ-Oxo)(μ-carboxylato)diiron(III) Complexes with Distinct Iron Sites. Consequences of the Inequivalence and Its Relevance to Dinuclear Iron-Oxo Proteins
Richard E. Norman,Shiping Yan,Lawrence Que,Gabriele Backes,Jinshu Ling,Joann Sanders-Loehr,Jian H. Zhang,Charles J. O'Connor +7 more