Crystal Structure and Catalytic Elimination of Methanol from Two Novel Organic–Inorganic Hybrid Based on Silicomolybdenate, Silicotungstate and 2-Aminopyrimidine

Abstract

Two new organic–inorganic hybrid, namely, (C4H7N3)2·(SiMo12O40)·(C4H5N3)2·(H2O)2 (1), (C4H7N3)2·(SiW12O40)·(C4H5N3)2·(H2O)2 (2) were synthesized by reaction of silicomolybdenate/silicotungstate and 2-aminopyrimidine and characterized by FT-IR, UV–vis, Fluorescence and single-crystal X-ray diffraction techniques. Compound 1 exhibit a two-dimensional supramolecular network via hydrogen bond interactions. Compound 2 show a three-dimensional supramolecular extended by two-dimensional pore structure constructed by the 2-aminopyrimidine molecules. Compound 1 emits green fluorescence and compounds 2 emits cyan fluorescence. The catalytic experimental results showed that compound 2 is active for catalytic oxidation of methanol in a continuous-flow fixed-bed micro-reactor, when the initial concentration of methanol is 5.37 g·m−3 in air and flow rate is 5 mL·min−1 at 90 °C, corresponding to the elimination rate of methanol is 53.09 % which is significant in environment protection.