Abstract
Two Cd(II) coordination polymers [Cd_3Na_2(btec)_2 (H_2O)_2 ]_n (1) and {[Cd_3Na_2 (btec)_2∙(H_2O)_2]∙4H_2O}_n(2)(H_4btec = 1,2,4,5-benzenetetracarboxylic acid) were synthesized by hydrothermal method. The structures were determined by single crystal X-ray diffraction. Structural analyses show that the asymmetric units of polymers 1 and 2 contain two crystallographically unique Cd(II) ions with six-and eight- coordinate, respectively, and they possess 3D structures bridged by btec^(4-) groups. The structure differences between them are that the coordination environment around Na(I) ions is different and polymer 2 has lattice water molecules. The photo-electric properties of the two polymers were investigated by surface photovoltage spectroscopy(SPS). The results of SPS show that the two polymers exhibit obvious photovoltage responses in the range of 300-500 nm, which indicates that they all possess certain photo-electric conversion properties. The SPS and UV-Vis spectra of the polymers were interrelated, and XRD patterns and TG curves of the two polymers were measured and analyzed.
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