以新型[Mo<sub>8</sub>Na<sub>2</sub>O<sub>28</sub>]<sup>6-</sup>多阴离子为建筑单元的 2D→3D 互锁配位聚合物的组装、结构及性质

Abstract

A novel 2D inorganic-organic hybrid coordination polymer based on polyoxometalate [Mo₈Na₂O₂₈]^6-, [Ni(Btp)₂(H₂O)][Mo₈Na₂O₂₆(<italic>μ</italic>₂-OH)₂]_0.5·H₂O(1). (Btp = 1,3-bis(1,2,4-triazol-1-yl)propane), has been prepared under hydrothermal reaction with a mixture of (NH₄)₆Mo₇O₂₄·4H₂O, NiCl₂·6H₂O, flexible ligand (Btp), NaOH and water, and structurally characterized by elemental analyses, IR spectroscopy, TG, and single-crystal X-ray diffraction analysis. X-ray crystal structure analysis shows that, the compound belongs to monoclinic crystal system, space group <italic>P</italic>2₁/<italic>c</italic>, crystal data: <italic>a</italic> = 11.6871(8) Å, <italic>b</italic> = 21.7506(15) Å, <italic>c</italic> = 14.9208(8) Å, <italic>Z</italic> = 4, <italic>R</italic>₁ = 0.0487, <italic>wR</italic>₂ = 0.1409. Compound 1 contains a kind of new polyoxometalate cluster [Mo₈Na₂O₂₈]^6-, which could be regarded as the transformation from β-[Mo₈O₂₆]^4- and with the structural characteristics similar to [V₁₀O₂₈]^6- polyanion. The polyoxometalates are sandwiched by the 2D layer constructed by Ni^II and Btp, leading to the formation of sandwich-like 2D columnar layer. The 2D columnar layer penetrates each other and finally results in the construction of an interesting 2D→3D polycatenated structure. In addition, the title complex shows good electrocatalytic and photocatalytic activity.