SYNTHESES AND STRUCTURES OF ONE-DIMENSIONAL AND 2-DIMENSIONAL COPPER(I) COORDINATION POLYMERS WITH TETRAKIS(ETHYLTHIO)TETRATHIAFULVALENE (TTC2-TTF) AND THE PROPERTIES OF THEIR IODINE-DOPED COMPOUNDS

Two copper(I) complexes with tetrakis(ethylthio)tetrathiafulvalene (TT C2-TTF), [(CuCl)(2)TTC2-TTF] (1) and [(CuBr)(2)TTC2-TTF] (2), have bee n synthesized and characterized by spectroscopic and X-ray crystallogr aphic methods. Both 1 and 2 are neutral 2:1 (metal/ligand) complexes i n which each metal ion is coordinated in a distorted tetrahedral geome try to two bridging halide ions and two sulphur atoms from TTC2-TTF. T he crystal of 1 has a two-dimensional structure in which TTC2-TTF mole cules are connected between novel helical CuCl frames, while the cryst al of 2 has a one-dimensional polymeric chain structure. The average C u-Cl and Cu-S bond lengths are 2.282(2) and 2,405(2) Angstrom in 1 and Cu-Br and Cu-S bond lengths are 2,445(2) and 2,349(1) Angstrom in 2, respectively. Compounds 1 and 2 were doped with iodine to afford [(CuC l)(2)TTC2-TTF]I (3) and [(CuBr)(2)TTC2-TTF]I (4) which exhibit electri cal conductivities of 6 x 10(-7) and 3 x 10(-7) S cm(-1), respectively , at 25 degrees C for compacted pellets.