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Volumn 44, Issue 22, 2005, Pages 7751-7761

Synthesis, crystal structure, and solution stability of Keggin-type heteropolytungstates(NH4)

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EID: 27744564632     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic048155l     Document Type: Article
Times cited : (20)

References (76)
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    • Polyoxometalates
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    • (b) A series of 34 recent papers devoted to polyoxoanions in catalysis is given in: Hill, C. L. J. Mol. Catal. 1996, 114, 1-365,
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    • note
    • The literature on multiple metal-substituted framework-incorporated polyoxoanions is extensive. A representative summary of 40 relevant references (Table S1) and further information on additional literature (Table S2) is provided in the Appendix of the Supporting Information.
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    • and refs 5 and 6 therein
    • For references concerning synthesis and characterization of multiple metal-substituted (3A and 3d) polyoxometalates based on nona- and decatungstosilicates and -phosphates see: Wassermann, K.; Palm, R.; Lunk, H.-J.; Steinfeld, N.; Stösser, R. Inorg. Chem. 1995, 34, 5029-5036 and refs 5 and 6 therein.
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    • Previously classified as multiple metal-substituted framework- incorporated polyoxoanions, see: Weiner, H.; Hayashi, Y.; Finke, R. G. Inorg. Chem. 1999, 38, 2579-2591.
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    • Ph.D. Thesis, Université des Sciences et Techniques du Languedoc: Montpellier, France
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    • note
    • II) spectra.
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    • -3 M solution of paratungstate B for 18 h at 80°C, the amount of monotungstate and metatungstate was found to have declined in favor of the heptatungstate. After 120 h, the heptatungstate ion remains as the main species in solution. (a) Jander, G. Z. Anorg. Allg. Chem. 1951, 265, 244-254.
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    • 2O (Na-PT, paratungstate B), was prepared according to a known literature procedure (Vallance, R. H. J. Chem. Soc. 1931, 1421-1435). Its identity was confirmed by IR spectroscopy in comparison to the literature and by TGA.
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    • The two central, nonexchanging protons in metatungstate are observed at ∼1.5 ppm with respect to solvent water. (a) Pope, M. T.; Varga, G. M., Jr. J. Chem. Soc., Chem. Commun. 1966, 653-654.
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    • Ehrenberg, A., Malström, B. E., Vänngart, T., Eds.; Pergamon Press: London, UK
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    • note
    • -1.
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    • 2+ which results in the formation of Keggin anions with identical charge (6-), and the purification of the final products can be tedious. (a) Mair, J. A. J. Chem. Soc. 1950, 2364-2372.
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    • The two central, nonexchanging protons in metatungstate are observed at ∼1.5 ppm with respect to solvent water, (a) Pope, M. T.; Varga, G. M., Jr. J. Chem. Soc., Chem. Commun. 1966, 653-654.
    • (1966) J. Chem. Soc., Chem. Commun. , pp. 653-654
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