AN ORGANIC-INORGANIC SALT CONTAINING MIXED-VALENCE TTF CHAINS AND THE MOLECULAR-METAL OXIDE CLUSTER [MO8O26]-4 - PRELIMINARY SPECTROSCOPIC, CONDUCTING AND MAGNETIC-PROPERTIES OF THE COMPOUND (TTF)7MO8O26

A new organic-inorganic salt formed by mixed-valence TTF chains and [Mo8O26]-4 is obtained by electrochemical oxidation of the donor in acetonitrile solution containing the polyanion. A unusual zigzag stacking of the donor molecules along the b-axis of the triclinic cell is observed, with close intrachain and interchain contacts through the sulphur atoms (the shortest S-S distances are about 3.5 angstrom). A semiconducting behavior has been observed with a conductivity sigma = 10(-3) S.cm-1 at room temperature. The magnetic properties indicate that the compound is non magnetic.