Synthesis and structure of [PPh(4)](3)[Cr(Te(4))(3)].DMF: the first tris(tetratelluride) complex

The compound [PPh(4)](3)[Cr(Te(4))(3)].DMF has been synthesized from the reaction of Cr(CO)(6) with a polytelluride solution in dimethylformamide at 100 degrees C. The compound has been characterized by (125)Te NMR and single-crystal X-ray diffraction techniques. The compound crystallizes in the triclinic space group P(-)1, with a = 12.991(3) A, b = 14.782(3) A, c = 24.628(5) A, alpha= 90.63(3)o, beta= 104.45(3)o, gamma= 106.49(3)o, and Z = 2 (T = 153 K). The [Cr(Te(4))(3)](3-) anion consists of a Cr(III) center chelated by three Te(4)(2-) ligands in a distorted octahedral environment. The anion has the Deltalambdalambdalambda (or Lambdadeltadeltadelta) conformation.