| Abstract: | Reduction of the ??-Keggin anion [Xn+O4W12O36][8-n]- (X = H22+, B3+, Si4+) by six electrons results in the known tungsten "brown" species [Xn+O4(H2O)3WIV3WVI9O33][8-n]- in which three W atoms have been reduced from WVI to WIV, forming a metal-metal bonded triad. The WIV atoms have terminal water coordinated in place of terminal oxo groups. Additional tungstate can condense onto these water molecules in aqueous solution between pH = 4 and 6.5 to form the species reported here, [(XO4)WIV3WVI17O 62Hx]y-. The boron derivative (X = B3+) is more stable than the metatungstate (X = H22+), both of which have been characterized by elemental analysis, 183W NMR and X-ray crystal structure analysis. Eight additional tungstate groups condense in the form of a partial Keggin structure containing two triads and one dyad which is rotated 60?? relative to a hypothetical ??-isomer. ?? The Royal Society of Chemistry 2000. |
| Genre: | Article |
| ProdID: | 70022406 |
| Citation Author: | Dickman, M. H.; Ozeki, T.; Evans, Jr. , H. T.; Rong, C.; Jameson, G. B.; Pope, M. T. |
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| Citation End Page: | 154 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the Chemical Society, Dalton Transactions |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Polyoxometalates from heteropoly "brown" precursors. A new structural class of mixed valence heteropolytungstates, [(XO4)W3IVW17VIO 62Hx]n-; 2000; Article; Journal; Journal of the Chemical Society, Dalton Transactions; Dickman, M. H.; Ozeki, T.; Evans, Jr. , H. T.; Rong, C.; Jameson, G. B.; Pope, M. T. |
| Citation Start Page: | 149 |
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| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Polyoxometalates from heteropoly "brown" precursors. A new structural class of mixed valence heteropolytungstates, [(XO4)W3IVW17VIO 62Hx]n-; 2000; Article; Journal; Journal of the Chemical Society, Dalton Transactions; Dickman, M. H.; Ozeki, T.; Evans, Jr. , H. T.; Rong, C.; Jameson, G. B.; Pope, M. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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