A new organic-inorganic hybrid material constructed from Keggin polyanion and transition metal complexes: [Co(2,2′-bipy)₃]_1.5[SiW^VW^VI₁₁O₄₀Co(2,2′-bipy)₂(H₂O)] · 0.5H₂O

Abstract

A new organic-inorganic hybrid compound constructed from Keggin-type polyanion clusters and transition metal complexes, [Co(2,2′-bipy)₃]_1.5[SiW^VW^VI ₁₁O₄₀Co(2,2′-bipy)₂(H₂O)]  · 0.5H₂O (1), has been hydrothermally prepared and characterized by elemental analysis, IR, UV–Vis, TG-DTA and single crystal X-ray diffraction. Compound 1 crystallized in the monoclinic system, space group C2/c, a  = 46.995(15), b  = 14.487(5), c  = 26.205(9)Å, β  = 90.000(0)°, V  = 17841(10)ų, Z  = 4. Compound 1 contains a [SiW^VW^VI ₁₁O₄₀Co(2,2′-bipy)₂(H₂O)]³⁻ polyoxoanion in which [Co(2,2′-bipy)₂(H₂O)]²⁺ is covalently bonded to the α-Keggin-type heteropolyanion [SiW^VW^VI ₁₁O₄₀]⁵⁻ via a terminal oxygen.

Keywords:

• Polyoxometalates
• Hydrothermal synthesis
• Dodecatungstosilicate
• Keggin-type

Acknowledgements

This work was supported by the Nature Science Foundation of China, the Program for New Century Excellent Talent in University of Hennan Province, the Foundation of Educational Department of Henan Province, and the Natural Science Foundation of Henan Province.