Diffusion-limited acid-base nonexporiential dynamics

Boiko Cohen, Dan Huppert*, Noam Agmon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Using time-resolved fluorescence, we have measured the direct proton transfer reaction between a photoacid, 2-naphthol-6-sulfonate, and a base, acetate anion, in water-glycerol mixtures. The reaction shows clear evidence for irreversible diffusion-controlled reactivity in agreement with the Smoluchowski model. As the solution viscosity increases, from about 1 cP (neat water) to 40 cP at 0.4 mole fraction of glycerol, the initial ROH* fluorescence decay becomes increasingly nonexponential, providing clear evidence for the transient regime of the Smoluchowski model for a real chemical reaction.

Original languageEnglish
Pages (from-to)7165-7173
Number of pages9
JournalJournal of Physical Chemistry A
Issue number30
StatePublished - 2 Aug 2001


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