NEW DERIVATIVES OF TETRATHIAFULVALENES (TTF) - TOWARDS ORGANIC METALSOF ENHANCED DIMENSIONALITY

In order to get pi-donors prone to develop organic metals of enhanced dimensionality (> 1D), the TTF or TSF derivatives 1-4 bearing two or f our 1,4-dithiafulven-6-yl substituents adequately R-substituted have b een synthesized. Usual and thin layer cyclic voltammetries evidence th eir tremendous pi-donor ability and also the various stoichiometries o f the salts produced upon their oxidation. Among them, X ray structure of [2 (saturated, R=H)](1)(ClO4)(1) exhibits an unusual 2-D network a nd behaves as a semiconductor of uncommon high conductivity (close to 1 S.cm(-1) at r.t.). This property is indicative of weak Coulombic rep ulsions as well as strong interactions between the oxidized donors. By changing the R-substituents of 2 we have recently obtained a (2)(2)(a nion)(1) salt endowed with a 2D character.