Koji Yui

New electron acceptors for organic metals: extensively conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ)

Two conjugated homologues of thiophene–7,7,8,8-tetracyanoquinodimethane (TCNQ) have been prepared, which form highly conductive complexes with typical electron donors such as 2,2′,5,5′- tetrathiafulvalene (TTF) or 5,6,11,12-tetrathiatetracene (TTT); these complexes have extensive conjugation.

3,4-dichalcogen-bridged fluoranthenes as new electron donors

Abstract Three 3,4-dichalcogen-bridged fluoranthenes were prepared with a view of developing new electron donors. Their donor strength was observed to increase in order of the chalcogen triad, i.e., sulfur, selenium, and tellurium.

2,5-bis(dicyanomethylene)-2,5-dihydrofuran and its conjugated homologues as novel oxygen-containing electron acceptors

Abstract The title furanoquinonoid compounds have been prepared in order to design new oxygen-containing organic metals, but most of them behaved as week electron acceptors to form low-conductive molecular complexes. An X-ray crystallographic analysis of the TTF complex of 5,5′-bis(dicyanomethylene)-5,5′-dihydro-δ 2,2′ -bifuran revealed that the bifuranoquinonoid conjugation takes a planar trans form and the embedded oxygens do not take part in any intermolecular interaction. On the other hand, 3,3′-dibromo-5,5′-bis(dicyanomethylene)-5,5′-dihydro-δ 2,2′ -bifuran as a modified acceptor gave a high-conductive TTT complex of 2.4 Scm −1 .