Graham A. Bowmaker, Effendy, Fariati, Susanto I. Rahajoe, Brian W. Skelton, Allan H. White
Single crystal X-ray structure determinations are described for a number of adducts of 1:2 MX 2:L stoichiometry, [M = divalent metal (Zn, Cd); X = halide (Cl, Br, I), L = (variously hindered) monodentate nitrogen (pyridine) base: py = pyridine, 2-mpy = 2-methylpyridine, quin = quinoline]: [(2-mpy) 2ZnX 2] (X = Cl, Br) (isotypic, triclinic P1, a ≈ 7.9 6, b ≈ 8.7, c ≈ 11.4 Å, α ≈ 86, β ≈ 79.3, γ ≈ 67°, Z = 2), [(2-mpy) 2ZnI 2], [(quin) 2ZnX 2] (X = Br) (isotypic with the previously determined chloride, X = Cl, triclinic, P1, a ≈ 8.7, b ≈ 9.6, c ≈ 11.1 Å, α ≈ 81, β ≈ 73, γ ≈ 72°, Z = 2); [(quin) 2ZnI 2]; [(2-mpy) 2CdX 2], X = Br {isotypic with [(2-mpy) 2ZnX 2], X = Cl, Br (above)}, X = I {isotypic with [(2-mpy) 2ZnI 2] (above)}; [(quin) 2CdI 2]. A single molecule, with a four-coordinate quasi-tetrahedral metal atom, N 2MX 2, comprises the asymmetric unit of the structure in each of these. A one-dimensional polymer is found for [(quin) 2Cd(μ-Cl) 2] (∞|∞), similar to those recorded previously for CdX 2:py (1:2) (X = Cl, Br, I), the cadmium atom here lying on a 2-axis in tetragonal space group P4 2 1c, and the quin ligands coordinating trans in a six-coordinate array about the cadmium, with successive cadmium atoms being linked by pairs of bridging chlorines. Adducts of MX 2:L (1:1) stoichiometry, defined for M = Cd: [(2,4,6-trimethylpyridine)Cd(μ-I) 2] (∞|∞) and [(quin)Cd(μ-Br) 2] (∞|∞), are both infinite one-dimensional polymers ⋯(μ-X) 2Cd(L)(μ-X) 2Cd(L)⋯, with five-coordinate trigonal bipyramidal cadmium atoms, the nitrogen donors being equatorial in the coordination spheres. The far-IR spectra of [L 2MX 2] (L = py, 2-mpy, quin; M = Zn, Cd; X = Cl, Br, I) are assigned and discussed in relation to the structures of the complexes. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand; School of Biomedical, Biomolecular and Chemical Sciences, Chemistry M313, University of Western Australia, Crawley, WA 6009, Australia; Jurusan Kimia, FMIPA, Universitas Negeri Malang, Malang 65145, Jalan Semarang 5, Indonesia; Jurusan Kimia, Institut of Teknologi Bandung, Bandung 40132, Jalan Ganesha 10, Indonesia
