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Two New Nonlinear Optical and Ferroelectric Three-Dimensional Metal−Organic Frameworks with an sqp-net

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posted on 06.01.2010, 00:00 by Yong-Tao Wang, Gui-Mei Tang, Yong-Qin Wei, Ting-Xiao Qin, Tian-Duo Li, Chao He, Ji-Bei Ling, Xi-Fa Long, Seik Weng Ng
Two novel three-dimensional metal-coordination polymers [Cd2(L)42-X)(X)(H2O)]n [X = Cl (1) and Br (2)] have been solvothermally synthesized by the self-assembly of an unsymmetric bridging ligand, [L = 2-(1H-imidazol-1-ylmethyl)-1H-benzoimidazole], and cadmium salts with different anions, respectively. The two complexes are isostructural and exhibit an acentric sqp-net, in which the cadmium ions act as unusual five-connected nodes. The induction of the flexible and unsymmetric ligand leads them to crystallize in a noncentrosymmetric polar packing arrangement, which displays a second harmonic generation response and ferroelectric behaviors.