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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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Journal ArticleDOI
Yizhan Wang1, Haolong Li1, Wei Qi1, Yang Yang1, Yi Yan1, Bao Li1, Lixin Wu1 
TL;DR: In this article, a chiral amphiphilic cation with two stereocenters has been employed to encapsulate a well-known catalytically activated sandwich-type polyoxometalate, Na12[WZn3(H2O)2(ZnW9O34)2], through electrostatic interaction.
Abstract: In this paper, a chiral amphiphilic cation with two stereocenters has been employed to encapsulate a well-known catalytically activated sandwich-type polyoxometalate, Na12[WZn3(H2O)2(ZnW9O34)2], through electrostatic interaction. The prepared chiral organic cation-encapsulated polyoxometalate complexes were found to self-aggregate into spherical supramolecular assemblies with a diameter of ca. 100 nm in the reaction solution. These assemblies, serving as microreactors, exhibited an efficient asymmetric catalytic activity for the oxidation of sulfide with up to 72% enantiomeric excess. The coverage density of chiral organic cations enwrapped on the polyoxometalate surface was proved to have an important influence on the enantioselectivity. Detailed kinetic study of the catalytic process showed that the enantioselectivity of sulfide oxidation was derived from the combination of an ineffective asymmetric sulfoxidation and an effective kinetic resolution of the sulfoxide. The present research strategically offers an understanding for the direct and efficient construction of polyoxometalate based supramolecular catalysts for asymmetric reactions through controlling the surface microenvironment.

42 citations

Journal ArticleDOI
TL;DR: Two new polyoxometalate (POM)-based three-dimensional metal organic carbene frameworks were hydrothermally synthesized, in which Keggin-type polyoxoanions as templates induce the formation of two different kinds of metal-carbene nanocages (MCNCs) for the first time.
Abstract: Two new polyoxometalate (POM)-based three-dimensional metal organic carbene frameworks, [Ag10(trz)4(H2O)2][HPW12O40] (POMs@MCNCs-1) and [Ag10(trz)4(H2O)6][H2SiW12O40] (POMs@MCNCs-2), were hydrothermally synthesized, in which Keggin-type polyoxoanions as templates induce the formation of two different kinds of metal–carbene nanocages (MCNCs) for the first time. Combination of the reversible multielectron redox behavior and electron storage functions of POMs with the good electrical conductivity of the single-walled carbon nanotubes (SWNTs) renders the POMs@MCNCs-1/SWNT composite excellent electrochemical performance and good stability as anode materials of lithium-ion batteries, with up to 2000 mA h g–1 for the first discharge capacity and ca. 859 mA h g–1 for the second cycle at a current density of 100 mA g–1. The successful fabrication of unprecedented MCNCs into the POM-based three-dimensional metal–organic frameworks in the present work must initiate extensive research interests in diverse fields.

42 citations

Journal ArticleDOI
TL;DR: In this article, a molecular Keggin polyoxometalate catalyst was successfully synthesized and efficiently catalyzed the hydrogen evolution under the visible light irradiation condition, which achieved 13,395μmol h −1 ǫg −1 −1, which is the highest among all the polyoxmetalates photocatalytic systems reported so far.

42 citations

Journal ArticleDOI
TL;DR: In this paper, a novel (4,8)-connected 3D polyoxometalate-based metal-organic framework was constructed using an in situ-generated ligand based on copper cations as square-planar four-connected nodes and Keggin polyanions as cubical eight-connections.
Abstract: A novel (4,8)-connected 3D polyoxometalate-based metal–organic framework has been constructed using an in situ-generated ligand based on copper cations as square-planar four-connected nodes and Keggin polyanions as cubical eight-connected nodes.

42 citations

Journal ArticleDOI
TL;DR: Just as POM cluster anions control the reactivities of metal centers in molecular complexes, directly coordinated POM ligands with tunable redox potentials now provide new options for rationally controlling the reactions of semiconductor nanocrystals.
Abstract: Polyoxometalate (POM) cluster anions are shown to serve as covalently coordinated ligands for anatase-TiO2 nanocrystals, giving isolable assemblies uniquely positioned between molecular macroanions and traditional colloidal nanoparticles. Na(+) salts of the water-soluble polyanionic structures are obtained by reacting amorphous TiO2 with the 1 nm lacunary ion, Na7 [α-XW11 O39 ] (X=P(5+) ), at 170 °C, after which an average of 55 α-PW11 O39 (7-) clusters are found as pentadentate ligands for Ti(IV) ions covalently linked to 6 nm single-crystal anatase cores. The attached POMs are reversible electron acceptors, the reduction potentials of which shift in a predictable fashion by changing the central heteroatom, X, directly influencing a model catalytic reaction. Just as POM cluster anions control the reactivities of metal centers in molecular complexes, directly coordinated POM ligands with tunable redox potentials now provide new options for rationally controlling the reactions of semiconductor nanocrystals.

42 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023246
2022566
2021213
2020218
2019187
2018216