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 groupP2₁/c, (C_2h⁵ No. 14) witha=6.875(1),b=15.478(2),c=7.074(1)Å,=90.98(1) andZ=2. The structure was solved by the heavy-atom method, and least-squares refinement of structural parameters led to a conventionalR 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.