A Study on the Molecular Complexes of Crowned Tetrathiafulvalenes

Abstract

In an attempt to develop\ a functionalized organic metal, we have synthesized novel tetrathiafulvalene [6] and a ielated compound, 2-(4 H-thiopyran-4-ylidene)-1, 3-dithiole [7], which are fused with crown ether. They form crystalline 1: 1 charge-transfer complexes with strong r-electron acceptors such as TCNQ, TCNQF₄, DDQ, and HCBD. In addition, they form a complex with heavy metal salts, such as AgNO₃, CuCl₂, and PdCl₂. The electrical conductivities of these complexes are, however, semiconductive or insulating without exception. A single crystal X-ray analysis of [6]⋅TCNQ complex demonstrates that it has a unique stacking structure of alternate donor-donor-acceptor-acceptor sequence.