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    • Keywords


      Excited-state proton transfer; pyranine; fluorescence spectroscopy; direct proton transfer.

    • Abstract


      Excited-state proton transfer (ESPT) of pyranine (8-hydroxypyrene-1,3,6-trisulphonate, HPTS) to acetate in methanol has been studied by steady-state and time-resolved fluorescence spectroscopy. The rate constant of direct proton transfer from pyranine to acetate ($k_1$) is calculated to be $\sim 1 \times 10^9$ M-1 s-1. This is slower by about two orders of magnitude than that in bulk water ($8 \times 10^{10}$ M-1 s-1) at 4 M acetate.

    • Author Affiliations


      Sudip Kumar Mondal1 Subhadip Ghosh1 Kalyanasis Sahu1 Pratik Sen1 Kankan Bhattacharyya1

      1. Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032
    • Dates

  • Journal of Chemical Sciences | News

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