Semiconducting spin-crossover cobalt (II) compound with non-integer charge distribution among TCNQ radicals

A cobalt(II) compound, [Co-II(terpy)(2)](TCNQ)(4)center dot 3DMF center dot 0.5H(2)O (1; terpy = 2,2';6',2 ''-terpyridine, TCNQ = 7,7',8,8'-tetracyanoquinodimethane), was found to show incomplete spin-crossover properties in the cobalt(II) complex and semiconducting properties in the quasi one-dimensional packed TCNQ center dot(delta-) (0<1) radical anions. Single-crystal structures characterized at different temperatures demonstrated non-integer charge distribution among TCNQ radicals. Moreover, electric conductivity measurements revealed that I act as semiconductor at 300 K (3.3 x 10(-4) S cm(-1)). The coexistence of spin crossover and electric conductivity in one system will pave the way to study the interactions of such different properties and for the implementation of multifunctional materials. (C) 2017 Elsevier B.V. All rights reserved.