Synthesis, structure and properties of an unsymmetrical tetraselenafulvalene donor fused with a pyrazino-ring (PEDTTSeF), and its cation radical salts

An organic conductor with a stable metallic state derived from its quasi-2D Fermi surface is reported. Pyrazinoethylenedithio-TTF is known to form a 2 D network which should but does not facilitate conduction through intermole cular N-S and S-S contacts. The exchange of selenium for sulfur in these sy stems, discussed here, results in the formation of the desired metallic sta te.