Abstract
We report here the stoichiometry and the binding strength of coumarin 343 (C343) with β-cyclodextrin (β-CD) and with C-hexylpyrogallol[4]arene (C-HPA) using absorption, steady state fluorescence, time-resolved fluorescence and 2D ROESY NMR spectroscopic techniques. The effect of pH on C343 in water and in the presence of β-CD or C-HPA is studied. The ground state and the excited state pKa values for the neutral-monocation equilibrium of C343 are reported. The opposite fluorescence behavior of C343 in the presence of β-CD and in C-HPA is discussed.
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We thank the Department of Science and Technology, Government of India, for the financial support though the project SR/FT/CS-062/2009.
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Chandrasekaran, S., Muthu Vijayan Enoch, I. Host–guest association of coumarin 343 with β-cyclodextrin and C-hexylpyrogallol[4]arene: opposite fluorescent behavior and prototropic characteristics. J Incl Phenom Macrocycl Chem 80, 225–234 (2014). https://doi.org/10.1007/s10847-014-0380-z
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DOI: https://doi.org/10.1007/s10847-014-0380-z