Metallocene‐Based Magnets

Structure and Properties of Nitrogen-Rich 1,4-Dicyanotetrazine, C4N6: A Comparative Study with Related Tetracyano Electron Acceptors

“…DCNT was also anticipated to react with Fe II (C 5 Me 5 ) 2 to form the electron transfer salt [Fe III (C 5 Me 5 ) 2 ] + [ DCNT ] •– , which like [Fe III (C 5 Me 5 ) 2 ] + [ TCNE ] •– should exhibit ferromagnetic coupling if not order as a ferromagnet, as occurs for several electron transfer salts of [Fe III (C 5 Me 5 ) 2 ] + [acceptor] •– composition . Upon reaction of Fe II (C 5 Me 5 ) 2 and DCNT in THF, the reaction mixture turned green, suggestive of electron transfer.…”

Structures of the Solvated Organic-Based Ferromagnet Decamethylferrocenium Tetracyanoethenide, [FeCp*2]·+[TCNE]·−·yRCN (R = Me, Et, n-Pr)

“…Decamethylferrocenium tetracyanoethenide, [FeCp* 2 ] •+ [TCNE] •− , 1 , was characterized to be a bulk three-dimensional (3-D) ferromagnet ( T c = 4.80 K) in the mid-1980s. , The saturation magnetization of 1 is 37% more than that of iron metal on either an Fe or a mole basis, and its discovery nucleated the study of organic-based magnets for which 1 is the prototype . Because of extensive structural disorder, the crystal structure of 1 could not be determined at room temperature, and upon cooling the crystals disintegrated, as it underwent two structural phase transitions at 249 and 282 K .…”

Preface for the Forum on Molecular Magnetism: The Role of Inorganic Chemistry

“…In the early stages of the field, which began to take shape in the 1980s, much of the effort was directed at the pursuit of molecule-based magnetic solids that order at high temperatures. These materials are basically of two types: those based on tetracyanoethylene (TCNE) and those based on cyanide . As the field rapidly evolved over the past two decades, exciting new challenges appeared on the horizon, including the use of building block approaches for the preparation of complex multifunctional magnetic materials, the fabrication of nanosized magnetic molecules and other nanostructures that exhibit quantum effects, and, the ultimate frontier, viz., the realization of practical applications.…”