STEREOCHEMICAL FEATURES OF TRIS(CHELATE) COMPLEXES - SYNTHESIS, CHARACTERIZATION, AND X-RAY CRYSTAL-STRUCTURE OF TRIS(DIISOBUTYLDITHIOCARBAMATO)V(III)

The synthesis and characterization of a tris(dialkyldithiocarbamate)V( III) complex is described, including the results of a single crystal X -ray diffraction investigation. The V atoms are surrounded by the six sulfur atoms of the chelating diisobutyldithiocarbamate ligands and ha ve structures that are quite compressed with geometries intermediate b etween that of an octahedron and a trigonal prism. An analysis of spec ific structural features of these complexes suggests the distortions o bserved have their origins largely in electronic effects, as opposed t o steric constraints imposed by the ligands. The structure crystallize s in the triclinic space group P1BAR with two crystallographically ind ependent molecules in the asymmetric unit and lattice parameters a = 1 1.629(3) angstrom, b = 17.773(6) angstrom, c = 18.947(8) angstrom, alp ha = 80.25(3)0, beta = 88.86(3)0, gamma = 76.29(2)0, V = 3748(2) angst rom3. Convergence to conventional R values of R = 0.048 and R(w), = 0. 059 was obtained for 667 variable parameters and 3306 reflections with I>3sigma(I).