Electrically conducting TCNQ derivatives of copper sulphur/nitrogen chelates; structure of a novel semiconducting complex [Cu(pdto)(TCNQ)]2 which contains N-bonded TCNQ (pdto = 1,8-di-2-pyridyl-3,6-dithiaoctane; TCNQ = 7,7,8,8-tetracyanoquinodimethane)

Reaction in water of Cu(pdto)(ClO4)2 with Li(TCNQ)/TCNQ mixtures yields solid crystalline materials of formulae Cu(pdto)(TCNQ)x(x= 2, 2.5, or 3) which display high electrical conductivities; reaction of Cu(pdto)(ClO4) with Li(TCNQ) yields Cu(pdto)(TCNQ), a poor conductor which has been shown by X-ray crystallography to have a novel dimeric structure involving π–π interaction between TCNQ units and which possesses Cu–TCNQ bonding.