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Interaction of Coumarin 7 and Coumarin 314 with C-hexylpyrogallol[4]arene

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Abstract

We report in this paper the different modes of interaction of coumarin 7 and coumarin 314 with the cavity-containing molecule C-hexylpyrogallol[4]arene. The stoichiometry and the binding constant of coumarin 7 for its binding with C-hexylpyrogallol[4]arene are reported. The analysis is done with UV–Vis absorption, steady-state and time-resolved fluorescence, and 2D ROESY spectroscopy. The fluorescence quenching of the two coumarins is analyzed and the Stern–Volmer constants are reported. The mode of binding of coumarin 7 with the host molecule is optimized with 2D ROESY. Coumarin 314 does not form an inclusion complex and this result is supported by the spectral data. The ground and the excited state pK a values for the coumarins, in the presence of C-hexylpyrogallol[4]arene, are reported.

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Acknowledgments

The authors express their sincere thanks to the Science and Engineering Research Board, Department of Science and Technology, Government of India, for the financial support through the Fast-Track Scheme for Young Scientists (Project SR/FT/CS-062/2009).

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Authors and Affiliations

  1. Department of Chemistry, Karunya Univerity, Coimbatore, 641 114, India

    Sowrirajan Chandrasekaran & Israel V. M. V. Enoch

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  1. Sowrirajan Chandrasekaran
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  2. Israel V. M. V. Enoch
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Correspondence to Israel V. M. V. Enoch.

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Chandrasekaran, S., Enoch, I.V.M.V. Interaction of Coumarin 7 and Coumarin 314 with C-hexylpyrogallol[4]arene. J Solution Chem 43, 375–387 (2014). https://doi.org/10.1007/s10953-014-0134-y

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  • DOI: https://doi.org/10.1007/s10953-014-0134-y

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