PLATINUM(II) DIBROMO,BIS (3,5-DIAMINO-1(2)-TRIAZOLIUM) DIBROMIDE - SYNTHESIS, CRYSTAL AND MOLECULAR-STRUCTURE, AND INFRARED CHARACTERIZATION

The title compound C4H12PtN10Br4 was prepared and characterized by means of X-ray, and IR measurements. The crystals are monoclinic, space group P2(1)/c, (C2h5 No. 14) with a = 6.875(1), b = 15.478(2), c = 7.074(1) angstrom, beta = 90.98(1) and Z = 2. The structure was solved by the heavy-atom method, and least-squares refinement of structural parameters led to a conventional R factor of 0.031 (R(w) = 0.030) for 733 independent reflections. The compound exhibits discrete monometallic units with the 1.2,4-triazolium ion acting as modentate ligand. The structure consists of centrosymmetric units in which the platinum atom is coordinated in perfectly planar geometry by two nitrogen and two bromine atoms. The NH and NH2 group of the guanazolium unit are involved in intermolecular hydrogen bonds. Infrared bands are diagnostic of the coordination environments around the metal atoms.