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

Magnetically ordered Ni[TCNE](2) . zCH(2)Cl(2) (T-c = 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) . zCH(2)O(2) (0 less than or equal to x < 1; y less than or equal to 2) composition has been characterized by IR spectrometry, elemental analysis, and magnetic measurements (ac and dc susceptibility). Substitution of Ni-II for V-II in V[TCNE](y) . zCH(2)Cl(2) does not alter the T-c significantly for x greater than or equal to 0.05 and does not alter H-cr significantly for x > 0; however, the magnitude of M increases with x, as does the broadness of the peaks in the chi(')(T) and chi(n)(T) ac susceptibilities. Hence, the magnetic properties of the room temperature V[TCNE](y) . zCH(2)Cl(2) magnet can be finely tuned via synthetic chemistry methodology, making this material more amenable in future technologies. (C) 2004 Elsevier B.V. All rights reserved.