X-RAY ABSORPTION-SPECTROSCOPY OF MN, CO, CU, AND ZN INORGANIC SALTS OF TETRATHIAFULVALENE AND BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE

X-ray absorption at the K edges of sulfur, chlorine, and transition-metal ions was investigated for two series of powdered materials: (TTF)14(MCl4)4 (with M = Mn, Co, and Zn), BEDT-TTF(MCl4)0.3-0.4 (with M = Mn, Co, Cu, and Zn) and in (TTF)6(MnCl3)3(MnCl2)3.13H2O. From the near-edge absorption fine structures (XANES) and comparison with model compounds, the stereochemistry at the metallic absorbing center is proposed (tetrahedral or distorted tetrahedral for all the MCl4(2-) except for the square planar Cu derivative). From the extended absorption fine structures (EXAFS), bond lengths, and Debye-Waller factors around the metallic ions and around the heavy atoms of the inorganic and of the organic species from which the materials are built, are calculated.