Q. Zhang, M. Yang, K. Xiong
2009
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Journal
Chinese Journal of Structural Chemistry
Abstract
A new two-dimensional Cd(II) coordination polymer, [Cd(2,5-pdch)(H2O)]n·2n(ClO4)· nH2O (2,5-pdch = pyridine-2,5-dicarbohydrazide), was prepared and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction analysis. The crystal belongs to monoclinic, space group P21/c with a = 10.905(2), b = 11.602(1), c = 15.034(2), β = 117.794 (10)°, V = 1682.8(4) 3, Z = 4, C7H13CdCl2N5O12, Mr = 542.52, Dc = 2.141 g/cm3, μ = 1.691 mm-1, F(000) = 1072, λ(MoKα) = 0.71073 , the final R = 0.0608 and wR = 0.1329 for 2972 observed reflections with I 2σ(I). Single-crystal X-ray diffraction analysis reveals that the Cd(II) atom displays a distorted pentagonal-bipyramidal geometry coordinated by three N atoms and three O atoms from three different 2,5-pdch ligands, and one water molecule. Interestingly, each two Cd(II) atoms are bridged by two carbohydrazide groups of the 2,5-pdch ligands to form a dimeric unit, and such dimeric units are further connected by the 2,5-pdch ligand to generate a two-dimensional (4,4)-network.