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Issue 17, 2015
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Reversible photodimerization of coumarin-modified Wells–Dawson anions

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Organo-modified photo-sensitive polyoxometalates (POMs) are a unique class of functional molecular materials. Here we show how the light-driven dimerization in organo-functionalized POMs can be achieved. To this end, the vanadium-substituted Wells–Dawson cluster [P2V3W15O62]9− was modified with a coumarin-based derivative to give the new organic–inorganic hybrid (nBu4N)4H2[C12H9O4NHC(CH2O)3P2W15V3O59]. Upon photo-irradiation, the compound undergoes photodimerization which was characterized using various spectroscopic methods including FT-IR, UV-vis, DLS (dynamic light scattering), 1H NMR, COSY NMR and ESI-MS. These results are in good agreement with the formation of dimer species. In addition, XPS and EPR analyses of the photo-irradiation product indicate that V5+ is partially reduced to V4+, while W6+ is not affected, suggesting that the coupled photo-dimerization and selective redox-switching might become possible.

Graphical abstract: Reversible photodimerization of coumarin-modified Wells–Dawson anions

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The article was received on 08 Feb 2015, accepted on 19 Mar 2015 and first published on 23 Mar 2015

Article type: Paper
DOI: 10.1039/C5TC00379B
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Citation: J. Mater. Chem. C, 2015,3, 4388-4393

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    Reversible photodimerization of coumarin-modified Wells–Dawson anions

    W. Chen, U. Tong, T. Zeng, C. Streb and Y. Song, J. Mater. Chem. C, 2015, 3, 4388
    DOI: 10.1039/C5TC00379B

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