Synthesis and characterization of platinum(II) complexes with 2-imidazolidinethione. X-ray crystal structure of tetra(2-imidazolidinethione-<b> <i>S</i> </b>)platinum(II) iodide dimethylsulfoxide solvate monohydrate

Abstract

Preparations of trans-[PtX2(Imt)2] (Imt = 2-imidazolidinethione, X=Cl− or I−) and [Pt(Imt)4]I2 are described. These complexes were characterized by elemental analysis, thermal analysis, mid- and far-IR spectroscopy, and NMR (1H and 13C) spectroscopy. The crystal and molecular structure of [Pt(Imt)4]I2 · DMSO · H2O was determined by X-ray diffraction methods. The structural data reveal the following features: (a) the platinum atom in [Pt(Imt)4]2+ is essentially in a square-planar environment, (b) the entire dication possesses approximately C 2h symmetry, (c) no appreciable hydrogen bonding exists between the iodide ions and the Imt ligands in the dication, (d) two pairs of two mutually cis Imt ligands are arranged above and below the PtS4 plane, respectively, and (e) two planes defined by two trans Imt rings are perpendicular to each other.