[CASB2(EDTA)(2)(H2O)(8)](N) - SYNTHESIS, CRYSTAL-STRUCTURE, AND THERMAL-BEHAVIOR

The synthesis and crystal structure of a new EDTA complex, [CaSb2(EDTA )(2)(H2O)(8)](n), are reported. This compound crystallizes in the mono clinic space group P2(1)/n, with a = 7.132(1) Angstrom, b = 21.893(3) Angstrom, c = 10.891(2) Angstrom, beta = 91.15(2)degrees. Sb(EDTA) ent ities are connected through carboxylate bridges to the calcium atoms r esulting in layers parallel to the (101) plane. These layers are linke d through a weak Sb ... O bond (3.171 Angstrom). Pyrolysis of this com plex under sulfur vapor, between 400 and 800 degrees C, leads to a mix ture of the monometallic sulfides. Pyrolysis in air above 700 degrees C allows the easy preparation of the mixed oxide CaSb2O6.