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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
TL;DR: In this paper, the first immobilization of the trivacant Keggin-type polyoxometalate ([A-PW9O34]9−, PW9) to prepare a novel heterogeneous oxidative catalyst is reported.

74 citations

Journal ArticleDOI
TL;DR: In this article, the authors reported on the assembly of three polyoxometalate-based organic-inorganic hybrid compounds with different helical channels, [Ag3(H2pyttz-I)2][PMo12O40] (1), [Ag6(H 2pyttzi-II)4][CoW12o40]·2H2O (2), and [Ag7(H pyttz)-II)3[GeW12O 40]·7H2
Abstract: Self-assembly of multiple components into well-defined and predictable structures remains one of the foremost challenges in chemistry. Here, upon subtle ligand variation, we reported on the assembly of three new polyoxometalate-based organic–inorganic hybrid compounds with different helical channel, [Ag3(H2pyttz-I)2][PMo12O40] (1), [Ag6(H2pyttz-II)4][CoW12O40]·2H2O (2), and [Ag7(Hpyttz-II)3(H2pyttz-II)][GeW12O40]·7H2O (3) (H2pyttz-I/II = 4-/3-pyrid-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazolyl, POM = polyoxometalates). X-ray diffraction analysis shows that compound 1 is constructed by “butterfly-like” Ag5(H2pyttz-I)2 subunits and POMs clusters, which are assembled into close helical channels impregnated with the components selves. Both compounds 2 and 3 are constructed by “paddle-wheel like” Ag4(H2pyttz-II)4 motifs and POMs clusters, which bring into being the larger helical channels (10.5% and 12.5% of the cell volume, respectively). Note that the only difference in compounds 2 and 3 is that the former conta...

74 citations

Journal ArticleDOI
TL;DR: Two polyoxometalate open framework materials have been synthesized using a secondary building unit (SBU) approach that facilitates the convergent assembly of multidimensional framework materials using a preassembled anionic SBU {P(8)W(48)}, with integrated "pore" 1 nm in diameter, and electrophilic manganese linkers.
Abstract: Two polyoxometalate open framework (POMOF) materials have been synthesized using a secondary building unit (SBU) approach that facilitates the convergent assembly of multidimensional framework materials using a preassembled anionic SBU {P8W48}, with integrated “pore” 1 nm in diameter, and electrophilic manganese {Mn2+} linkers. This yields two new POMOFS with augmented hexagonal tiling (2 and 3), related to a known three-dimensional (3D) cubic array K18Li6[MnII8(H2O)48P8W48O184]·108H2O (1), K12[MnII14(H2O)30P8W48O184]·111H2O (2), and K8Li4[MnII14(H2O)26P8W48O184]·105H2O (3). These frameworks have been crystallized from aqueous Li-buffered solutions of {P8W48} and MnII(ClO4)2·6H2O via careful control of the synthetic strategy akin to a crystal engineering approach using cation and temperature control to isolate different material architectures shown by compounds 1−3.

74 citations

Journal ArticleDOI
TL;DR: In this article, an ultrathin composite film containing polyoxometalate anions and a planar binuclear phthalocyanine, bi-CoPc, has been prepared by the electrostatic layer-by-layer self-assembly method.
Abstract: An ultrathin composite film containing both polyoxometalate anion [PMo12O40]3− (PMo12) and a planar binuclear phthalocyanine, bi-CoPc, has been prepared by the electrostatic layer-by-layer self-assembly method. UV-vis measurements revealed regular film growth with each four-layer {PMo12/bi-CoPc/PSS/PAH} adsorption. The film structure was characterized by small-angle X-ray reflectivity measurements, X-ray photoelectron spectra, and AFM images. The nanothick film shows a third-order nonlinear optical response of χ(3) = 4.21 × 10−12 esu. Experimental investigations also indicate that the combination of polyoxometalate anions [PMo12O40]3− with the phthalocyanine bi-CoPc in multilayer films can enhance the third-order NLO susceptibility and modify the third-order NLO absorption of bi-CoPc.

73 citations

Journal ArticleDOI
Haiyan An1, Dongrong Xiao1, Enbo Wang1, Yangguang Li1, Lin Xu1 
TL;DR: In this paper, a 2D chiral layer framework consisting of rare earth polyoxometalate helical chains and organic bridging ligands has been proposed, which leads to mesomeric solid state compounds.
Abstract: Four new polyoxoanion-based hybrids with a chiral layer structure, (C6NO2H5)[(H2O)4(C6NO2H5)Ln(CrMo6H6O24)]·4H2O (Ln = Ce, 1; Pr, 2; La, 3 and Nd, 4), have been synthesized and characterized by elemental analysis, IR spectroscopy, TG analysis and single crystal X-ray diffraction. All the compounds are isostructural and crystallize in the monoclinic space group C2/c. Their crystal structures consist of two kinds of chiral layers, one left-handed and the other right-handed, each built up from the same-handed rare earth polyoxometalate helical chains, which leads to mesomeric solid state compounds. To our knowledge, this represents the first example of a 2D chiral layer framework consisting of rare earth polyoxometalate helical chains and organic bridging ligands. The magnetic properties of compounds 1, 2 and 4 have been studied by measuring their magnetic susceptibility over the temperature range of 2–300 K.

73 citations


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