Synthesis, and electrical conducting and magnetic properties of a neutral bis(dimethylthiotetrathiafulvalenyldithiolate)copper complex

Aneutral copper complex (1) substituted with two TTF dithiolate ligands was successfully synthesized by the iodine oxidation of the corresponding monoanioniccomplex (2) obtained by the reaction of bis(tetramethylammonium) bis(2,3-dimethylthiotetrathiafulvalene-6, 7-dithiolato)zinc complex (3) with CuCl2. The complex 1 showed a high electrical conductivity (7.8 × 10−2 S·cm−1) on the compressed pellet at room temperature. On the other hand, a very low value (1.0 × 10−6S·cm−1) was obtained for 2. The ESR and SQUID measurements suggest significant interaction between the copper d spin and conducting TTF π electron in 1.