Synthesis, crystal structure and thermal behavior of a new molybdenum-oxygen cluster: [Ni(en)_3]_2(H_3BO_3)(MoO_4)_2 centre dot (6H_2O)

摘要

A new molybdenum-oxygen cluster: [Ni(en)_3]_2(H_3BO_3)(MoO_4)_2 centre dot (6H_2O) containing interstitial boric acid has been synthesized and characterized by elemental analyses, FT-IR spectroscopy and DTA-TG. Its structure was determined by single crystal X-ray diffraction. The title compound crystallizes in a trigonal system and space group P3 with a = b = 93271 (8)A, c=12.543 (2) A, alpha = beta = 90 deg, gamma = 120 deg, V=945.0 (2)A~3, Z=1, D_c = 1.701 g/cm~3. The structure consists of two MoO_4~(2-) tetrahedra clusters, two [Ni(en)_3]~(2+) octahedra clusters and one H_3BO_3 unit, in which these clusters are absolute and self-assemble via N-H...O and O-H...O hydrogen bonds to form a wide range of supramolecular frameworks. The thermal decomposing process occurs in three steps.