Anomalous H+ and D+ Excited-State Proton-Transfer Rate in H2O/D2O Mixtures

Oren Gajst, Ron Simkovitch, Dan Huppert

Research output: Contribution to journalArticlepeer-review

Abstract

We used the time-resolved fluorescence technique to measure the excited-state proton-Transfer (ESPT) rates from 8-hydroxy-1,3,6-pyrenetrisulfonate (HPTS) to solvent mixtures of H2O and D2O. We found an anomalous deviation from linear mole-fraction behavior of the ESPT rate in H2O/D2O mixtures. We provide a chemical model based on equilibrium constant of the reaction H2O + D2O â" 2HOD and rate constants of the ESPT process of H and D transfers from HPTS to the mixed solvent. Anomalous deviation from linear mole-fraction behavior was previously found for H+/D+ conductance in these mixtures.

Original languageEnglish
Pages (from-to)6917-6924
Number of pages8
JournalJournal of Physical Chemistry A
Volume121
Issue number37
DOIs
StatePublished - 21 Sep 2017

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