Synthesis, Crystal Structure and Photocatalytic Properties of a Supramolecular Assembly Based on Keggin Polyoxotungstate

摘要

A new supramolecular compound （4,4＇-bipyH）4[SiW12O40]（4,4＇-bipy） （4,4＇-bipy = 4,4＇-bipyridine） was synthesized hydrothermally and characterized by single-crystal X-ray diffraction and IR spectrum. The crystallography analysis for the title compound reveals that the crystal crystallizes in monoclinic, space group C2/m with a = 22.2767（12）, b = 21.1879（11）, c = 15.6942（8） A, β = 97.068（3）°, V = 7351.3（7） A3, Cs0H44N10040SiW12, Mr = 3659.24, Z = 4, Dc = 3.306 g/cm3, F（000） = 6544, GOOF = 1.137, R = 0.0577 and wR = 0.1579. The title compound consists of a discrete Keggin-type [SiWl2O40]4- anion, one 4,4＇-bipy and four protonated （4,4＇-bipyH）＋ cations. The [SiWl2O40]4- anion and protonated 4,4＇-bipy are connected to form a supramolecular structure by hydrogen bonds. Meanwhile, the title compound exhibits good photocatalytic activity for color degradation of Rhodamine-B dye solution under visible-light irradiation.