Polyoxotungstate

Yang, Y., Wu, Q., Guo, Y., Hu, C., and Wang, E. (2005) Efficient degradation of dye pollutants on nanoporous polyoxotungstate-anatase composite under visihle-light irradiation. Journal of Molecular Catalysis A Chemical, 225 (2), 203-212. 

Examples of Polyoxotungstate Compounds Obtained in the Solid State... 

Polyoxotungstates, 41 193 Polyoxovanadates, 41 193 Polyoxygen species, 32 115 Polypropylenes, preparation and properties of, 23 299-302... 

K(,SiW 02 )Mn I I) Manganese ion-substituted silicon polyoxotungstate can be used as a mediator for alcohol oxidation. Constant potential electrolysis of 1-phenylethanol at 1.25 V in the presence of 5 mol% of the catalyst gave acetophenone in 61% yield [33]. 

The monosubstituted iron polyoxotungstate is prepared by the addition of a solution of Fe3+ to a solution of K10a2-[P2W17O61] 15HzO, which yields a dark yellow-orange solution. 

In the reoxidation of heteropolyanions, reduced forms of polyoxomolybdates and polyoxovanadates are stable and hardly reoxidized by molecular oxygen, whereas polyoxotungstates undergo facile reoxidation (257). 

Although terminal oxo complexes of the late-transition-metal elements have been proposed as possible intermediates for oxidations catalyzed by these elements, late-transition-metal-oxo complexes were scarcely known. Hill and coworkers reported the synthesis and characterization of Pt4 + -, Pd4 + - and Au3 + -oxo complexes, [M(0)(0H2) W0(0H2) (PW9034)2]m (M = Pt, Pd and Au, n = 0-2), stabilized by electron-accepting polyoxotungstate ligands [109-111]. The stoichiometric reaction of the Au-oxo complex [Au(0)(0H2) W0(0H2) 2 (PW9034)2]9 with triphenylphosphine led to the formation of triphenylphosphine oxide. 

Dondi, D., Fagnoni, M., Molinari, A., Maldotti, A., and Albini, A. (2004) Polyoxotungstate photoinduced alkylation of electrophilic alkenes by cycloalkanes. Chemistry - A European Journal, 10, 142-148. 

Tanielian C, Duffy K, Jones A. Kinetic and mechanistic aspects of photocatalysis by polyoxotungstates a laser flash photolysis, pulse radiolysis, and continuous photolysis study. J Phys Chem B 1997 101 4276-82. 

The W6+ ions in the surface polyoxotungstates are supposed to be octahedrally coordinated, and are therefore coordinatively saturated. This is indicated by the fact that W6+-CO complexes were not detected by IR spectroscopy when CO was added to the sample.16,21... 

A series of polyoxotungstate anions which contain high valent rhenium, e.g. [Si-W10Re2O40]2 /3 /4, have been synthesized in the form of Bu"N+ salts.639 The anions contain rhenium in oxidation states VII, VI and V. Cyclic voltammograms, ESR and electronic absorption spectra have been used to characterize these complexes. 

Figure 5.4 The structure of [ Ce(H20)4(al-P2Wi706i) 2] [16]- (Reprinted with permission from M.H. Dickman, et ah, Chiral polyoxotungstates. 1. Stereoselective interaction of amino acids with enantiomers of [Ce (al-P2Wi706i)(H20) c] - The structure of DL-[Ce2(H20)g(P2Wi706i)2], /no r an/c Chemistry, 40, no. 12, 2715-2719 (Figure 1), 2001. 2001 American Chemical Society.)...

Figure 5.6 The structure of [La(W50is)2] [21a]. (Reprinted from RA. Ahneida, et al., A lan-thanum(III) complex with alacunary polyoxotungstate Na2(NH4)7[La(W50i8)2]-16H20, Acto Crystal-lographica, E61,128-131 (Figure 1), 2005, with permission from International Union of Crystallography (lUCr).)...

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