TTF derivatives containing fused-pyrazine rings for novel donor- acceptor systems

In this work, novel TTF derivatives fused with electron-accepting pyrazine rings are described. We have succeeded in preparing two kinds of TTF derivatives containing two pyrazine rings. Furthermore, we have prepared asymmetrical TTF derivatives containing one pyrazine ring to increase the electron-donating properties. In some cases, hydroxyl groups were introduced to induce intcrmolecular hydrogen bonds. Oxidation of hydroquinone derivatives afforded a new type of donor-acceptor compounds with quinone units, which showed both oxidation and reduction potentials. The electrical conductivity of the D-A compound was about 10−8 S/cm as single component. We have also prepared several CT complexes based on the new TTF derivatives and investigated the structures and properties.