Syntheses, structures, and photocatalysis of five inorganic–organic hybrid compounds constructed from Keggin polyoxometalate clusters and multidentate N-donor ligands

Abstract

Five inorganic–organic hybrid compounds have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction analyses, infrared spectra, elemental analyses, powder X-ray diffraction, and thermogravimetric analyses. In 1, each 2,2ʹ-tmbpt ligand links two Cu(II) ions to generate a highly undulated chain. The chains are further bridged by [SiW₁₂O₄₀]^4‒ anions to form a layer. Compound 2 exhibits a 3-D (3,4,5)-connected framework with large channels, in which [SiW₁₂O₄₀]^4‒ anions are tetradentate linkages. In 3, each 2,4ʹ-tmbpt links three Cu(II) ions to form 2-D layers, which are further linked by [SiW₁₂O₄₀]^4‒ to yield a 3-D (3,4)-connected framework. In 4, each 4,4ʹ-tmbpt connects three Cu(II) ions to generate 1-D double chains. In 5, [PW₁₂O₄₀]^3‒ link Cu(II) ions to generate 1-D chains. Compounds 1‒5 exhibit photocatalytic activities for degradation of methylene blue and rhodamine B.

Graphical Abstract

Five inorganic–organic hybrid compounds have been synthesized, and the photocatalytic properties of the compounds have also been studied.

Keywords:

• Polyoxometalates
• Multidentate N-donor ligand
• Inorganic–organic hybrid
• Topological analyses
• Photocatalysis

Acknowledgements

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (21202058), the Natural Science Foundation of Jiangsu Province (BK2011408), the Opening Project of Key Laboratory for Chemistry of Low-Dimensional Materials of Jiangsu Province (JSKC12109), and the Cultivation Fund of the Key Scientific Innovation Project of Huaiyin Normal University (11HSGJBZ11).