Methyl and dimethyl derivatives of tetrathionaphthalene and tetraselenonaphthalene as novel electron donors

Monomethyl and dimethyl tetrathionaphthalenes and tetraselenonaphthalenes h ave been developed as modified electron donors. Introduction of methyl grou ps is very helpful in enhancing the inherent low solubilities of the parent compounds. In the cyclic voltammograms, they show two reversible redox wav es, whose first and second oxidation potentials are gradually lowered with the increasing number of the introduced methyl groups. They all are able to form charge-transfer complexes with tetracyanoquinodimethane. Irrespective of the chalcogen kind of the donor, the complexes of the dimethyl derivati ves ave conductive, while those of the monomethyl derivatives ave insulatin g. The different conductivities are explained by the difference of their cr ystal structures, which are studied by infrared spectroscopy (C) 2001 John Wiley & Sons, Inc.