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Anomalous H+ and D+ Excited-State Proton-Transfer Rate in H2O/D2O Mixtures
The Journal of Physical Chemistry A ( IF 2.9 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acs.jpca.7b04361
Oren Gajst 1 , Ron Simkovitch 1 , Dan Huppert 1
Affiliation  

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.

中文翻译:

H 2 O / D 2 O混合物中异常的H +和D +激发态质子转移速率

我们使用时间分辨荧光技术测量了从8-羟基-1,3,6-吡咯烷磺酸盐(HPTS)到H 2 O和D 2 O的溶剂混合物的激发态质子转移(ESPT)速率。我们发现H 2 O / D 2 O混合物中ESPT速率的线性摩尔分数行为的反常偏差。我们基于反应H 2 O + D 2 O↔2HOD的平衡常数以及从HPTS到混合溶剂的H和D转移的ESPT过程的速率常数,提供了一个化学模型。以前在这些混合物中发现了H + / D +电导率与线性摩尔分数行为的反常偏差。
更新日期:2017-09-11
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