Polyoxometalates synthesis

The structure of [(Y0H2)3(C03)(A-a-PW9034)2]" [25]. (Reprinted with permission from T.M. Anderson, W.A. Neiwert, and C.L. HiU, Yttrinm polyoxometalates. Synthesis and characterization of a carbonate-encapsulated sandwich-type complex, Inorganic Chemistry, 42, no. 26, 8600-8602 (Figure 1), 2003. 2003 American Chemical Society.)... 

Molybdenum coordination has recendy been comprehensively reviewed in Comprehensive Coordination Chem istry, particularly in the areas of mononuclear complexes, polyoxometallate synthesis, structure, and reactivity see also Polyoxometalates), and in chalcogen-containing cluster complexes. ... 

Errington, R. J. Rational Approaches to Polyoxometalate Synthesis, In Polyoxometalate chemistry From topology via self-assembly to applications Pope, M. T. Muller, A., Eds. Kluwer Dordrecht, The Netherlands, 2001 pp 7-22. 

However, since polyoxometalate synthesis is normally carried out in water by mixing the stoichiometrically required amounts of monomeric metal salts and adjusting the pH to a specific acidic value, many other structure types are accessible... 

Jahier, C., Coustou, M., Cantuel, M., et al. (2011). Optically Active Tripodal Dendritic Polyoxometalates Synthesis, Characterization and their Use in Asymmetric Sulfide Oxidation with Hydrogen Peroxide, Eur. J. Inorg. Chem., pp. 727-738. 

Catalysts for Fine Chemical Synthesis Volume 2 Catalysis by Polyoxometalates... 

Polyoxoacids, defined, 41 117,118 Polyoxometalates defined,41 117,118 transition-metal-substituted, 41 224-225 Polyoxomolybdates, 41 193 Polyoxotetramelhyleneglycol, synthesis, 41 156-157... 

Some fimctionalized materials have also been prepared by coprecipitation at low supersaturation. A perylene chromophore, for example, has been intercalated into LDH in an attempt to prepare stabihzed pigments [40]. Catalyt-ically active species have also been introduced into the interlayers of LDHs by direct synthesis, e.g. the intercalation of (PWi204o) or (SiWi204o) gives catalysts or catalyst precursors containing interlayer polyoxometalate anions [41]. Vein et al. reported the synthesis of Zr-containing LDH-Hke... 

R. Schroden, C. Blanford, B. Melde, B.J.S. Johnson, and A. Stein Direct Synthesis of Ordered Macroporous SUica Materials Functionahzed with Polyoxometalate Clusters. Chem. Mater. 13, 1074 (2001). 

A very interesting report was published on the self-assembly of polyoxometallate elusters into a 3-D heterometallie framework via eovalent bonding synthesis, strueture and eharaeterization of... 

Polyoxometalates. As regards the synthesis and characterization of some POMs, special thanks are addressed to Dr. R. Contant (Universite Paris VI), Professor C.L. Hill, Dr. T.M. Anderson and Professor I.K. Hardcastle (Emory University, Atlanta), Professor U. Kortz (International University of Bremen), Professor M.T. 

W, V and Co has been widely investigated [28]. This section will highlight some novel and unique approaches to epoxide synthesis using environmentally benign oxidants and heterogeneous metal catalysts such as solid-supported Ti, polyoxometalates and hydrotaldte. 

The use ofhydrothermal-like synthesis for the preparation of Mo/V/Al/O catalysts, starting from Anderson-type polyoxometalates, leads to monophasic crystalline compounds, also containing other trivalent elements (Fe, Ga), and dopants [13]. For example, the incorporation of Ti in Mo/V/Al/O gives rise to the formation of a compound having stoichiometry Mo6V2Al1Ti0 5Ox, in which the addition of Ti improves the activity with respect to the undoped system. 

Synthesis and structural chemistry of polyoxometalates containing rare-earth ions Naruke (2003b)... 

Previous Volumes in this Series have described, in general, practical tips for performing topical reactions. Volume 2 was however dedicated specifically to Catalysis by Polyoxometalates . The present Volume features recent advances in the application of microporous and mesoporous solid catalysts to fine chemical synthesis, a field that is receiving increasing attention because of its high potential for the development of green processes for the synthesis of fine chemicals. 

Troupis A, Gkika E, Hiskia A, Papaconstantinou E. Photocatalytic reduction of metals using polyoxometallates recovery of metals or synthesis of metal nanoparticles. CR Chimie 2006 9 851-7. 

Chibwe, K. and Jones, W. (1989). Synthesis of polyoxometalate-pillared layered double hydroxides via calcined precursors. Chem. Mater. 1, 489. 

Narita, E., Kaviratna, P. D. and Pinnavaia, T. J. (1993). Direct synthesis of a polyoxometalate-pillared layered double hydroxide by coprecipitation. J. Chem. Soc., Chem. Commun., 60. 

Figure 11.5 Structure and synthesis of the polyoxometalate (POMs) library L4 and POM-catalyzed sulfide-sulfoxide oxidation of 11.4.

Maksimov G.M. Achievements in the synthesis of polyoxometallates and investigation ofheteropolyadds. Uspekhi Khimii 1995 64 480-92. 

Polyoxometalates have found applications in analytical and clinical chemistry, catalysis (including photocatalysis), biochemistry (electron transport inhibition), medicine (antitumoral, antiviral, and even anti-HIV activity), and solid-state device [19,20], Recently, three-dimensional ordered materials are modified by the incorporation of POM into wall structures using a direct synthesis approach [21,22], The motivation for the work lies in the novel properties that POM is introduced into silica networks [19,20], The incorporation is that the POM is linked to silica matrix by covalent grafting. A class of POM that are particularly attractive for the preparation of hybrid materials are the lacunary POM. Lacunary POMs include the mono and divacant unsaturated Keggin fragments [X" W,039]< ">- (X"+=B Ge P [22], [ Y -SiWioOgg] [21], Lacunary... 

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