Structures, magnetic and catalytic properties of three sandwich-type silicotungstates containing tetranuclear copper(II) clusters

Dalton Transactions : an International Journal of Inorganic Chemistry
Fan YuLan-Sun Zheng

Abstract

Three sandwich-type silicotungstates, formulated as [Cu4(H2O)2(SiW9O34)2] x 12 NH4 x 22 H2O (1), [Cu4(H2O)2(SiW9O34)2] x 12 NH4 x 11 H2O (2) and {[Cu(NH3)4]2[Cu(H2O)4][Cu4(H2O)2(SiW9O34)2]} 2[Cu(NH3)4(H2O)] x 2 NH4 x 6 H2O (3), were synthesized by microwave irradiation and hydrothermal reaction. Crystal structural analysis reveals that 1-3 possess the same dimeric polyoxoanions [Cu2SiW9O34(H2O)]2(12-) featuring tetranuclear copper(II) clusters. Magnetic studies indicate that the Cu4 clusters exhibit ferromagnetic coupling interactions. Investigation on their catalytic activity for the oxidation of ethylbenzene suggests that catalytic activity of 1-3 is closely related to the acidity of complexes and the existence of unsaturated coordination sites in the complex.

References

Nov 29, 2001·Journal of the American Chemical Society·J T RhuleC L Hill
Feb 6, 2003·Chemistry : a European Journal·Manolis J ManosThemistoklis A Kabanos
Aug 6, 2003·Angewandte Chemie·Pierre MialaneFrancis Sécheresse
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May 12, 2005·Angewandte Chemie·Ulrich KortzMarkus Reicke
May 12, 2005·Angewandte Chemie·Sib Sankar Mal, Ulrich Kortz
Mar 4, 2008·Inorganic Chemistry·Anne DolbecqFrancis Sécheresse
Aug 8, 2009·Chemical Communications : Chem Comm·Jun KimWha-Seung Ahn
Oct 28, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Fan YuLan-Sun Zheng

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Citations

Aug 2, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Wen-Feng ZhaoChuan-De Wu
Apr 6, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Bin WangLi-Xin Wu

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