A polymeric chain formed by bicapped pseudo-Keggin polyoxometalate and [Ni(en)₂]²⁺ complexes: synthesis, structure and catalytic properties of {[H₃PMo₈V₆O₄₆][Ni(en)₂]} · 2[Ni(en)₂] · 5H₂O

Abstract

A new compound {[H₃PMo₈V₆O₄₆][Ni(en)₂]} · 2[Ni(en)₂] · 5H₂O with a polymeric chain structure was hydrothermally synthesized and characterized by single crystal X-ray diffraction, IR and TG. The molybdovanadophosphate cluster anion is a bicapped ‘pseudo-Keggin’ structure, in which two vanadium atoms are located at two ‘capping’ metal atom positions, another four vanadium atoms and eight molybdenum atoms are arranged as phosphorus-centered alternate layers of molybdenum and vanadium oxides. The title compound exhibits high catalytic activity for selective oxidation of benzyl alcohol to benzaldehyde. The influence of catalyst amount, the ratio, H₂O₂/C₆H₅CH₂OH, reaction time and catalyst lifetime on the catalytic activity was studied.

Keywords:

• Polyoxometalate
• Molybdovanadophosphate
• Inorganic-organic hybrid compound
• Hydrothermal synthesis
• Catalysis

Acknowledgements

This work was financially supported by the Natural Science Foundation of Fujian Province, China (No. E0510012), and the Natural Science Foundation of Education Department of Fujian Province Government, China (No. JA04167).