期刊
INORGANICA CHIMICA ACTA
卷 363, 期 6, 页码 1236-1242出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2009.08.023
关键词
Hybrid material; Polyoxometalate; Crystal structure
资金
- MOST [2006CB932904, 2007CB815304]
- National Natural Science Foundation of China [20425313, 20821061, 50772113]
- Chinese Academy of Sciences [KJCX2-YW-M05]
- Natural Science Foundation of Fujian Province [2006L2005, 2006F3135, 2006F3141]
By controlling the reaction temperature, pH value of the system and the polyanion templates, three inorganic-organic hybrid materials based on Keggin polyoxometalate building blocks combined with Cu-I/II and 4-amino-1,2,4-triazole (4atrz) have been obtained by hydrothermal methods, namely, [Cu-3(mu(3)-OH)(4atrz)(6)][SiW12O40]center dot I center dot 3H(2)O (1), [Cu-4(4atrz)(6)][SiW12O40] (2) and [Cu-6(4atrz)(6)][PMo12O40](2)center dot H2O (3). Crystal structure analysis reveals that the Cu-I/II/4atrz complexes in the three materials show tri-, tetra- and hexanuclear models, respectively. In compound 2, the copper clusters link the polyoxometalates into the chains by weak Cu-O bonds; while in the compounds 1 and 3, the copper clusters and the polyoxometalates stack by the ionic interactions. These compounds are further characterized by powder XRD, elemental analyses, FT-IR and thermogravimetric (TG) analyses. The electrochemical behavior of 3-CPE has been studied in the 1 M H2SO4 solution. The results exhibit that there are four pairs of redox waves attributable to the four consecutive two-electron processes of Mo(VI/V) couples and the redox process is surface-controlled. (C) 2009 Elsevier B.V. All rights reserved.
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