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Synthesis, crystal structure and electrochemical behavior of tetranuclear transition metal clusters based on lacunary silicotungstates: [M4(H2O)2(SiW9O34)2]10− (M = Ni2+, Co2 +) and [Fe4(μ-O)2(μ-OH)2(SiW10O37)2]14−

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Abstract

Three tetranuclear transition metal clusters based on lacunary silicotungstates [M4(H2O)2(SiW9O34)2]12− (M = Ni2+ (1), Co2+ (2)), and [Fe4(μ-O)2(μ-OH)2(SiW10O37)2]14− (3) have been synthesized under ambient conditions and characterized by elemental analyses, IR, TG, cyclic voltammetry, and single-crystal X-ray diffraction. The polyoxoanions of 1 and 2 are isostructural, including a central rhomb-like {M4O16} (M = Ni, Co) cluster sandwiched by two trivacant {B-α-SiW9} Keggin moieties. In the polyoxoanion of 3, two μ-OH and two μ-O bridges link with four FeIII ions, forming an eight-membered ring. This [Fe4(μ-OH)2(μ-O)2] aggregation is sandwiched by two bi-vacant {α-SiW10} Keggin fragments. The electrochemical properties of the three compounds were investigated.

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Acknowledgments

This work was supported by the National Science Foundation of China (No. 20701005/20701006), Science and Technology Development Project Foundation of Jilin Province (No. 20060420), Analysis and testing foundation of Northeast Normal University (no. 201586000/201372000), Ph.D station Foundation of Ministry of Education (No. 20060200002), and Science Foundation for Young Teachers of Northeast Normal University (No. 20070302 and No. 20070312).

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Correspondence to Yang-Guang Li or En-Bo Wang.

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Zhao, X., Li, YG., Wang, YH. et al. Synthesis, crystal structure and electrochemical behavior of tetranuclear transition metal clusters based on lacunary silicotungstates: [M4(H2O)2(SiW9O34)2]10− (M = Ni2+, Co2 +) and [Fe4(μ-O)2(μ-OH)2(SiW10O37)2]14− . Transition Met Chem 33, 323–330 (2008). https://doi.org/10.1007/s11243-007-9043-x

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