Roy, Durba ; Karmakar, Rana ; Mondal, Sudip Kumar ; Sahu, Kalyanasis ; Bhattacharyya, Kankan (2004) Excited state proton transfer from pyranine to acetate in a CTAB micelle Chemical Physics Letters, 399 (1-3). pp. 147-151. ISSN 0009-2614
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.cplett.2004.09.125
Abstract
Proton transfer process of pyranine (8-hydroxypyrene-1,3,6-trisulfonate, HPTS) at the surface of a cationic micelle (cetyl trimethyl ammonium bromide, CTAB) has been studied by emission spectroscopy. At the CTAB micellar surface, pH is ~9.5 and the ground state pKa of HPTS is 10.2. These are higher compared to bulk water (pKa = 7.4 and pH 7). At the surface of the micelle, emission of HPTS is quenched by acetate ion with a bimolecular quenching constant, 3.5 × 107 M-1 s-1. This is markedly slower than the excited state proton transfer in a solvent separated HPTS-water-acetate complex in bulk water.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 77147 |
| Deposited On: | 10 Jan 2012 05:51 |
| Last Modified: | 10 Jan 2012 05:51 |
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