Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 194, Issue -, Pages 65-70Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.07.040
Keywords
Polyoxometalate; Bi-antimony capped Keggin cluster; Crystal structure; Cu-ligand
Funding
- Natural Science Foundation of China [20701011, 21072043]
- Doctoral Initial Foundation of Hebei Normal University [L2005B13]
- Hebei Natural Science Foundation of China [B2011205035]
- Education Department Foundation of Hebei Province [Z2006436]
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Three polyoxometalates consisting of bi-antimony capped Keggin-type clusters: [Cu(mbpy)(2)](2) [PMo12O40Sb2]center dot 4H(2)O (1), [Cu(mbpy)(2)][PMo12O40Sb2] (2) and {Cu(mbpy)[Cu(mbpy)(2)](2)}[VMo8V4O40Sb2]. 2H(2)O (3) (mbpy=4,4'-dimethyl-2,2'- dipyridyl in 1 and 2; 5,5'-dimethyl-2,2'-dipyridyl in 3) have been synthesized and characterized by IR, X-ray powder diffraction, TG analysis and electrochemical property. Single-crystal analysis revealed that all of three compounds are built upon bi-antimony capped Keggin-type polyoxoanions and Cu-mbpy cations. In 1-3, two Sb-III centers located at the two opposite of anionic surface adopt fundamentally tetragonal pyramidal coordination geometry. Both compounds 1 and 2 consist of P-centered Keggin structure, while compound 3 presents a V-centered Keggin anion. The Keggin-type anions present different structural features: isolated cluster in 1 and Cu-ligand-supported cluster in 2 and 3. (C) 2012 Elsevier Inc. All rights reserved.
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