CRYSTAL STRUCTURES OF A FAMILY OF LAYERED COORDINATION POLYMERS CONTAINING DIVALENT METAL IONS (Mn2+, Co2+, Ni2+ AND Zn2+) AND THE 3-AMINO 4-METHYL BENZOATE ION
M.K. Khosa1, P.T. Wood2, S.M. Humphrey3, W.T.A. Harrison4
1Government College University, Faisalabad, Pakistan
2University of Cambridge, Cambridge, UK
3The University of Texas at Austin, Austin, Texas, USA
4University of Aberdeen, Aberdeen, Scotland
Keywords: coordination polymer, bridging ligand, layered structure, coordination polymer, bridging ligand, layered structure
Abstract
The syntheses and crystal structures of the layered coordination polymers M(C8H8NO2)2 [M = Mn (1), Co (2), Ni (3) and Zn (4)] are described. These isostructural compounds contain centrosymmetric trans -MN2O4 octahedra as parts of infinite sheets; the ligand bonds to three adjacent metal ions in m3-N,O,O¢ mode from both its carboxylate O atoms and its amine N atom. In each case, weak intra-sheet N-H⋯O and C-H⋯O hydrogen bonds may help to consolidate the structure. Crystal data: 1, C16H16MnN2O4, M r = 355.25, monoclinic, P 21/ c (No. 14), a = 10.6534(2) Å, b = 4.3990(1) Å, c = 15.5733(5) Å, b = 95.1827(10)°, V = 726.85(3) Å3, Z = 2, R ( F ) = 0.026, wR ( F 2) = 0.067. 2, C16H16CoN2O4, M r = 359.24, monoclinic, P 21/ c (No. 14), a = 10.6131(10) Å, b = 4.3374(4) Å, c = 15.3556(17) Å, b = 95.473(4)°, V = 703.65(12) Å3, Z = 2, R ( F ) = 0.041, wR ( F 2) = 0.091. 3, C16H16N2NiO4, M r = 359.02, monoclinic, P 21/ c (No. 14), a = 10.6374(4) Å, b = 4.2964(2) Å, c = 15.2827(8) Å, b = 95.9744(14)°, V = 694.66(6) Å3, Z = 2, R ( F ) = 0.028, wR ( F 2) = 0.070. 4, C16H16N2O4Zn, M r = 365.68, monoclinic, P 21/ c (No. 14), a = 10.6385(5) Å, b = 4.2967(3) Å, c = 15.2844(8) Å, b = 95.941(3)°, V = 694.89(7) Å3, Z = 2, R ( F ) = 0.038, wR ( F 2) = 0.107.
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