Electrical Conductivity and Spin Crossover:A New Achievement with a Metal Bis Dithiolene Complex

摘要

Three new compounds based on the cationic complex [Fe~(III)(3-R-salEen)2]+ (salEen stands for N-(2-ethylamino)-ethyl)-salicylaldimine,R = H,CH3O) with the electroactive Ni(dmit)2 species as a counterion (dmit stands for 1,3-dithia-2-thione-4,5-dithiolato) have been synthesized and structurally and magnetically characterized.Compound 1 ([Ni(dmit)2][Fe(3-OMe-salEen)2].CH3OH) shows an apparent hysteresis loop,due to an irreversible desolvatation process.Compound 2 ([Ni(dmit)2](NO3)[Fe(salEen)2]2) exhibits a gradual and incomplete spin transition.Compound 3 ([Ni(dmit)2]5[Fe(salEen)2]2,6CH3CN) is a fractional oxidation state complex,which behaves like a semiconductor and exhibits a gradual but complete spin transition between 300 and 4 K.