Topic
Polyoxometalate
About: Polyoxometalate is a research topic. Over the lifetime, 3493 publications have been published within this topic receiving 94123 citations. The topic is also known as: POM.
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81 citations
TL;DR: A tin(II) tungstosilicate derivative K(11)H[Sn(4)(SiW(9)O(34))(2)]·25H(2)O with four sandwiched Sn(2+) cations was prepared by reaction of SnCl(2), KCl and Na(10)[α-SiW (9) O(34)]·xH( 2)O.
81 citations
TL;DR: Polyoxometalate clusters, which are nanosized metal-oxidemacroanions built from molecular precursors with a range of unique redox and acidic properties, are ideally suited for the development of functional nanospaces but have not yet been explored.
Abstract: are of great interestbecause of their unique properties such as adsorption,separation, exchange, and catalysis, which are all associatedwith the presence of a functional nanospace. In this respect,polyoxometalate clusters, which are nanosized metal-oxidemacroanions built from molecular precursors with a range ofunique redox and acidic properties, are ideally suited for thedevelopment of functional nanospaces but have not yet beenthus explored.
81 citations
TL;DR: In this article, a series of mesoporous ZrO2-based heteropoly acid nanocomposite frameworks has been prepared through a surfactant-assisted sol-gel copolymerization route.
Abstract: A series of well-ordered mesoporous ZrO2-based heteropoly acid nanocomposite frameworks has been prepared through a surfactant-assisted sol–gel copolymerization route. The pore walls of these materials consist of nanocrystalline tetragonal ZrO2 and Keggin-type 12-phosphomolybdic acid (PMA) components with different PMA loadings, i.e. 12, 22 and 37 wt%. Small angle X-ray scattering, high-resolution TEM and N2 physisorption measurements indicated mesoporous property in hexagonal p6mm symmetry with large internal BET surface areas and narrow-sized pores. The incorporated PMA clusters preserve intact their Keggin structure into the mesoporous frameworks according to EDX, FT-IR and diffuse-reflectance UV/vis/NIR spectroscopy. The obtained ZrO2–PMA nanocomposites demonstrated great application potential in oxidative catalysis, exhibiting exceptional stability and catalytic activity in oxidation of alkenes using hydrogen peroxide as oxidant.
81 citations
TL;DR: Electronic spectroscopy and electrochemical studies indicate that, while compounds 1-3 decompose in a pure aqueous medium, these complexes are very stable in a pH 6 acetate medium.
Abstract: Three high-nuclearity NiII-substituted polyoxometalate compounds functionalized by exogenous ligands have been synthesized and characterized. The octanuclear complexes in Na15[Na{(A-α-SiW9O34)Ni4(CH3COO)3(OH)3}2]·4NaCl·36H2O (1) and Na15[Na{(A-α-SiW9O34)Ni4(CH3COO)3(OH)2(N3)}2]·32H2O (2) can be described as two {Ni4} subunits connected via a {Na(CH3COO)6} group, with the acetato ligands also ensuring in each subunit the connection between the paramagnetic centers. In 2, two azido groups replace two of the six μ-hydroxo ligands present in 1. The nonanuclear complex K7Na7[(A-α-SiW9O34)2Ni9(OH)6(H2O)6(CO3)3]·42H2O (3) exhibits a double-cubane structure with two [(A-α-SiW9O34)Ni4(OH)3]5− subunits linked by three carbonato ligands. A ninth NiII center connected to one subunit via a carbonato ligand and a O═W group completes this asymmetric polyoxometalate. Electronic spectroscopy and electrochemical studies indicate that, while compounds 1−3 decompose in a pure aqueous medium, these complexes are very stable i...
81 citations