Effect of electrolytes on the excited-state proton transfer and geminate recombination

The Journal of Physical Chemistry. a
P LeidermanDan Huppert

Abstract

Time-resolved emission and steady-state fluorescence techniques are used to study the excited-state intermolecular proton transfer from 8-hydroxypyrene-1,3,6-trisulfonate (HPTS or pyranine) to water in the presence of inert salts, NaCl and MgCl(2). At low salt concentrations, up to about 0.5 M MgCl(2) or about 0.8 M NaCl, the time-resolved emission of both the photoacid and conjugate base can be quantitatively fitted by our diffusion-assisted geminate recombination model. In this concentration range, the proton transfer and geminate recombination rate constants are almost independent of the salt concentrations whereas the proton diffusion constant decreases as the salt concentration increases. At higher salt concentrations, the proton-transfer rate constant decreases while the recombination rate constant increases slightly. For the saturated solution of MgCl(2) (about 5 M at room temperature), the steady-state emission consists of only a single band of the protonated photoacid. Careful examination of the time-resolved emission of HPTS in the presence of a large concentration of MgCl(2) shows that the quality of the fit to the geminate recombination model is rather poor and we fail to find adjustable parameters for a good qualit...Continue Reading

References

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Mar 3, 2006·The Journal of Physical Chemistry. B·Rinat GepshteinNoam Agmon
Jul 15, 2006·The Journal of Physical Chemistry. a·Noam Agmon

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Citations

Jul 16, 2008·The Journal of Chemical Physics·Jeffrey C OwrutskyDavid A Kidwell
Jun 14, 2013·The Journal of Chemical Physics·Supratik Sen MojumdarKankan Bhattacharyya
Jan 9, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·M Jocelyn CoxHuib J Bakker
Nov 13, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Amit Kumar MandalKankan Bhattacharyya
Jul 1, 2015·The Journal of Physical Chemistry. B·Ron Simkovitch, Dan Huppert
Aug 12, 2014·The Journal of Physical Chemistry. B·Raj Kumar KonintiPartha Hazra
May 29, 2014·The Journal of Physical Chemistry. B·Rajdeep ChowdhuryKankan Bhattacharyya
Jun 29, 2012·The Journal of Physical Chemistry. B·Tridib MondalKankan Bhattacharyya
Oct 11, 2016·Physical Chemistry Chemical Physics : PCCP·Breland G OscarChong Fang
Sep 14, 2017·Physical Chemistry Chemical Physics : PCCP·Joonyoung F JoungSungnam Park
Oct 24, 2013·Physical Chemistry Chemical Physics : PCCP·Christian SpiesGregor Jung
Mar 21, 2008·The Journal of Physical Chemistry. a·Anna Uritski, Dan Huppert
Jul 21, 2006·The Journal of Physical Chemistry. a·Pavel LeidermanDan Huppert
Jan 30, 2009·The Journal of Physical Chemistry. B·Ramon Barnadas-Rodríguez, Joan Estelrich
Apr 29, 2015·The Journal of Physical Chemistry. B·Christian Lawler, Michael D Fayer

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