Ferromagnetic S=1 chain formed by a square Ni2S2 motif in Ni(qt)(2) (qt = quinoline-8-thiolate). Magnetic properties of related compounds

ML, complexes [M = Fe2+, Co2+, Ni2+, Cu2+; L = quinolin-8-olale (q), quinol ine-8-thiolate (qt)] were prepared and their magnetic properties were studi ed. X-ray crystal structure analysis of Ni(qr), reveals that nickel(II) ion s are arranged to form a one-dimensional structure with double thiolate bri dges. Magnetic susceptibility measurements of Ni(qt), indicate that the nic kel S= 1 spins are ferromagnetically coupled within a chain. Other ML, show ed antiferromagnetic interactions. Magnetic properties of molecular complex es of ML, with 7,7,8,8-tetracynanoquinodimethane (TCNQ) were also investiga ted. The crystal structure of Ni(qt)(2)(TCNQ) was determined. (C) 2001 Else vier Science Ltd. All rights reserved.