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Honeycomb-like layers constructed by hydrogen bonds. Synthesis, structure, and property of two new supramolecular compounds based on polyoxotungstate

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Abstract

Two new compounds based on polyoxotungstate [Co2(PCA)4(H2O)6][SiW12O40]·8H2O (1), [Cd2(PCA)4(H2O)6][SiW12O40]·8H2O (2) (PCA = pyridine-4-carboxylic acid) are prepared and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, and thermal analysis. The results of the single crystal X-ray diffraction analysis reveal that 1 and 2 are isomorphic and two water molecules in the compounds act as the bridging groups of two cobalt or cadmium atoms, forming dinuclear coordination cations. The ligand PCA adopts a monodentate coordination mode and its uncoordinated carboxyl oxygen atom and the protonized nitrogen atom form hydrogen bonds with other ligands, by which the cations are linked into a supramolecular 2D network with hexagonal grids. The polyoxotungstate anions are arranged above and below the cationic grids. A strong emission peak at 420 nm of 2 is attributed to a ligand-metal transition.

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Authors and Affiliations

  1. Key Laboratory of Polyoxometalate Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, P. R. China

    Q. -J. Kong, C. -X. Zhang & Y. G. Chen

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  1. Q. -J. Kong
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  2. C. -X. Zhang
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  3. Y. G. Chen
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Correspondence to Y. G. Chen.

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Original Russian Text Copyright © 2012 by Q.-J. Kong, C.-X. Zhang, Y. G. Chen

The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 53, No. 5, pp. 985–990, September–October, 2012.

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Kong, Q.J., Zhang, C.X. & Chen, Y.G. Honeycomb-like layers constructed by hydrogen bonds. Synthesis, structure, and property of two new supramolecular compounds based on polyoxotungstate. J Struct Chem 53, 967–972 (2012). https://doi.org/10.1134/S0022476612050216

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  • DOI: https://doi.org/10.1134/S0022476612050216

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