Thiophene-fused DCNQI Derivatives: Their Copper Iodide Complexes as a New Family of Molecular Conductors

Abstract

Organic sulfur compounds have played important roles in developing new organic materials. Recently we have reported that thiophene-fused DCNQI (DTQl)1 forms a new family of highly conducting CuI complex.¹ However, all our attempts to grow a single crystal suitable for an X-ray analysis have been unsuccessful. The presence of the configurational isomers with respect to the =N-CN orientation was suspected to prevent the growth of a single crystal of 1. Thus we have designed 2 and 3 that bear the substituents at β-position of the condensed thiophene rings; the β-substituents could fix the cyano-group on the opposite side of the substituent. We have also characterized compound 4 for comparison.