Ni[TCNE]2 · zCH2Cl2 (Tc = 13 K) and VxNi1 − x[TCNE]y · zCH2Cl2 solid solution room temperature magnets

Abstract

Magnetically ordered Ni[TCNE]2·zCH2Cl2 (Tc=13 K) is reported for the first time from the reaction of Ni(CO)4 with tetracyanoethylene (TCNE). A family of new solid solution room temperature magnets of VxNi1−x[TCNE]y·zCH2Cl2 (0≤x<1; y≤2) composition has been characterized by IR spectrometry, elemental analysis, and magnetic measurements (ac and dc susceptibility). Substitution of NiII for VII in V[TCNE]y·zCH2Cl2 does not alter the Tc significantly for x≥0.05 and does not alter Hcr significantly for x>0; however, the magnitude of M increases with x, as does the broadness of the peaks in the χ′(T) and χ″(T) ac susceptibilities. Hence, the magnetic properties of the room temperature V[TCNE]y·zCH2Cl2 magnet can be finely tuned via synthetic chemistry methodology, making this material more amenable in future technologies.