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Excited-state proton transfer from pyranine to acetate in methanol |
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| Authors: | Sudip Kumar Mondal Subhadip Ghosh Kalyanasis Sahu Pratik Sen and Kankan Bhattacharyya |
| Institution: | (1) Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India |
| 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 ∼1 × 109 M−1 s−1. This is slower by about two orders of magnitude than that in bulk water (8 × 1010 M−1 s−1) at 4 M acetate. |
| Keywords: | Excited-state proton transfer pyranine fluorescence spectroscopy direct proton transfer |
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