STRUCTURES OF THE NITROIMIDAZOLE PLATINUM-GROUP METAL-COMPLEXES NO]CARBONYL)METHYL)-2-NITROIMIDAZOLE]-PLATINUM(II) AND ROXYETHYL-2-METHYL-5-NITROIMIDAZOLE)-PALLADIUM(II)

l)-2-nitro-1-imidazole-kappaN'-acetamide]platinum, [PtBr2-(C7H10N4O4)( NH3)], (I), M(r) = 586.11, orthorhombic, Pnca, a = 15.214(6), b = 19.0 77(8), c = 9.991(4) angstrom, V = 2900 (2) angstrom3, Z = 8, D(x) = 2. 684 Mg m-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 15.25 mm-1, F(0 00) = 2160, T = 295, R = 0.062 and wR = 0.059 for 1521 unique observed reflections. Pt has a square-planar coordination. The Pt-Br bond tran s to the nitroimidazole ligand is slightly shorter [2.375(3) angstrom] than the Pt-Br bond trans to NH3 [2.397(3) angstrom]. The dihedral an gle between the Pt coordination plane and the imidazole ring is 69.1(8 )-degrees, while the nitro group makes an angle of 32(1)-degrees with the imidazole ring plane. The structure is stabilized by the hydrogen bonding of the NH3 ligands and the hydroxyl groups. hyl-5-nitro-1-imid azole-kappaN'-ethanol)palladium, [PdCl2(C6H9-N3O3)2], (II), M(r) = 519 .62, monoclinic, P2(1)/c, a = 7.155(4), b = 20.989(9), c = 7.148(4) an gstrom, beta = 115.37(4)-degrees, V = 970.0 (9) angstrom3, Z = 2, D(x) = 1.779 Mg m-3, lambda(MoKalpha) = 0.71069 angstrom, mu = 1.26 mm-1, F(000) = 520, T = 295, R = 0.027 and wR = 0.028 for 2260 unique observ ed reflections. The bond distances Pd-Cl = 2.297 (1) and Pt-N = 2.007 (2) angstrom. The dihedral angle between the Pd coordination plane and the imidazole ring is 88.6(1)-degrees, while the nitro groups make an angle of 3.9(3)-degrees with the imidazole plane. The structure is st abilized by hydrogen bonding between the hydroxyl groups and the chlor o ligands.