Novel channeled compound based on Cr(III) trinuclear complex and polyoxometalate aimed for heterogeneous catalysis: synthesis and structure

摘要

Keggin-type polyoxometalate [SiW_(12)O_(40)]~(4-), and Cr(III) trincluear cation [Cr_3O(OOCH)_6(H_2O_3)]~+, assembled in the presence of K~+ to form a novel complex, K_3[Cr_3O(OOCH)_6(H_2O)_3)]SiW_(12)O_(40)·2H_2O (1). The structure was confirmed by single crystal X-ray analysis . FT-IR and diffuse reflectance UV-vis spectroscopy. The investigation with FT-IR, and diffuse reflectance UV-vis measurements revealed that 1 was stable up to 200 ℃. It was revealed by single crystal X-ray analysis that 1 possesses a straight channel filled with water molecules, which can be removed upon heat treatment without degradation in the structure of the constituent ions.