CRYSTAL STRUCTURE OF BIS(2-AMINO-2-METHYL-3-BUTANONEOXIMATO)PLATINUM(II) CHLORIDE MONOHYDRATE

The crystal structure of bis(2-ammo-2-methyl-3-butanoneoximato)platinum(II) chloride monohydrate, C10H23N4O2PtCl. H2O, has been determined from three-dimensional X-ray diffraction data. Unit cell dimensions are a = 12.83 ± 0.02 Å, b = 11.03 ± 0.02 Å, c = 12.62 ± 0.02 Å, and β = 93.0 ± 0.2°. The space group is P21/c. The density by flotation is 1.94 g/cm3; four formula units in the unit cell give a calculated density of 1.95 g/cm3. The structure is isomorphous with that of the corresponding nickel complex. Refinement by full-matrix least squares led to a conventional R factor of 8.9% using 1324 visually estimated reflections. The complex has approximate symmetry (Cs) with the four nitrogen atoms in square-planar coordination about platinum with average bond distances: Pt-N(oxime), 1.98 (3) Å; Pt-N(amine), 2.03 (3) Å. The intermolecular O---O hydrogen-bond distance is 2.48 (4) Å. Intermolecular hydrogen bonding involving the chloride ion, the water molecule, and the amine nitrogens of the cation plays a major role in stabilizing the crystal structure. © 1969, American Chemical Society. All rights reserved.