SYNTHESIS, CRYSTAL-STRUCTURE, AND SOLVOLYSIS REACTION OF A H-T 3,3-DIMETHYLGLUTARIMIDATE-BRIDGED BINUCLEAR PLATINUM(II) COMPLEX, [PT2(NH3)4(C7H10NO2)2](NO3)2.H2O

Synthesis and crystal structure of a 3,3-dimethylglutarimidate-bridged platinum complex (1) are reported. 1 is a binuclear structure with two 3,3-dimethylglutarimidate ligands bridging in a head-to-tail (H-T) manner. Each platinum atom is coordinated with two amine ligands in the cis position, a deprotonated nitrogen atom, and an oxygen atom of the 3,3-dimethylglutarimidate ligands. The Pt-Pt separation within the complex cation is 2.939 (1) angstrom. Although the C-13 spectrum of 1 in D2O measured immediately after dissolution corresponds to the solid structure, the spectrum gradually changes to an unknown one, which indicates that the binuclear structure is not stably retained in D2O. From C-13 and Pt-195 NMR spectroscopy in D2O and DMSO-d6, it turns out that the solvolysis reaction occurs in solution and the binuclear complex changes to a mononuclear one. Compound 1 crystallizes in the monoclinic space group C2/c with a = 36.933 (7) angstrom, b = 10.473 (1) angstrom, c = 14.070 (4) angstrom, beta = 105.28 (2)-degrees, V = 5249.8 (9) angstrom 3, and Z = 8. Anisotropic refinement of all nonhydrogen atoms converged to the residuals R = 0.059 and R(w) = 0.045 (w = 1/sigma-2(F)).