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

作者：Gajst Oren; Simkovitch Ron; Huppert Dan^*

来源：Journal of Physical Chemistry A, 2017, 121(37): 6917-6924.

DOI：10.1021/acs.jpca.7b04361

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 <-> 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.

• 出版日期2017-9-21