Crystal structures of two one-dimensional coordination polymers constructed from Mn2+ ions, chelating hexafluoro-acetylacetonate anions, and flexible bipyridyl bridging ligands
M.J. Plater, B.M. De Silva, M.R. St J. Foreman, W.T.A. Harrison
University of Aberdeen, Aberdeen, Scotland
Keywords: manganese, coordination polymer, flexible ligand
Abstract
The syntheses and crystal structures of two one-dimensional coordination polymers, [Mn(C5HO2F6)2(C16H20N2)] n (1) and [Mn(C5HO2F6)2(C20H20N2)] n (2), are described, where is the hexafluoro acetylacetonate anion, C16H20N2 is 1,6-bis(4-pyridyl)-hexane, and C20H20N2 is 1,4-bis[2-(3-pyridyl)ethyl]-benzene. In both phases, the metal ion lies on a crystallographic twofold axis and is coordinated by two chelating anions and two bridging bipyridyl ligands to generate a cis -MnN2O4 octahedron. The bridging ligands, which are completed by crystallographic inversion symmetry in both compounds, connect the metal nodes into zigzag [20 ] chains in 1 and contorted [001] chains in 2. Intrachain C-H⋯O interactions occur in 1 but not in 2, which may be correlated with the relative orientations of the ligands. Crystal data: 1, C26H22F12MnN2O4, M r = 709.40, monoclinic, C 2/ c (No. 15), a = 9.3475(2) Å, b = 16.6547(3) Å, c = 18.3649(4) Å, b = 91.1135(8)°, V = 2858.50(10) Å3, Z = 4, R ( F ) = 0.030, wR ( F 2) = 0.075. 2, C30H22F12MnN2O4, M r = 757.44, monoclinic, C 2/ c (No. 15), a = 19.9198(2) Å, b = 10.6459(2) Å, c = 16.8185(3) Å, b = 119.8344(8)°, V = 3093.91(9) Å3, Z = 4, R ( F ) = 0.032, wR ( F 2) = 0.078.
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