Two multifunctional organic-inorganic hybrid complexes based on polyoxometalates,BiEDTA and sodium linker: crystal structures,photochromic, and catalytic performances |
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| Authors: | Chun-Lin Teng Han-Xi Xiao Qing Cai Jian-Ting Tang Tie-Jun Cai |
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| Institution: | 1. Department of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, China;2. Chemistry Department, City University of New York, New York, NY, USA;3. Key Laboratory of Theoretical Organic Chemistry and Functional Molecule for Ministry of Education, Hunan University of Science and Technology, Xiangtan, China |
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| Abstract: | Two 3-D organic–inorganic hybrid supermolecular complexes, Na(BiHEDTA·2H2O)3(PW12O40)·2H3O (BiPW) and Na(BiHEDTA·2H2O)3(PMo12O40)·2H3O·2H2O (BiPMo) ethylenediamine tetraacetic acid (EDTA) have been synthesized by solution method and characterized by ultraviolet visible (UV–vis) spectroscopy, thermogravimetric-differential thermal analysis, photoluminescence, cyclic voltammetry, and single-crystal X-ray diffraction (XRD). XRD analysis reveals that BiPW and BiPMo are isostructural with 3-D architectures assembled by 2-D layer tetranuclear cation and a Keggin-type polyoxoanion. Although these two hybrids exhibit similar structures, the properties depend on the nature of polyoxoanion PM12O40]3? (M = W, Mo). Under UV irradiation, BiPW and BiPMo show fast response of reversible and irreversible photochromism, respectively. BiPW exhibits excellent photocatalytic activity in degradation of methyl orange dyes under irradiation of UV–visible light. It can be reused for at least six cycles without obvious loss of activity in the degradation experiments; BiPMo shows catalytic activity in elimination of methanol. The elimination rate of methanol reaches 56.9% when the concentration of methanol is 2.3 g·m?3 and the flow velocity is 10 mL·min?1 at 100 °C. |
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| Keywords: | Polyoxometalates BiEDTA crystal structure catalytic activity photochromism |
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