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Hydrogen isotope exchange between pentafluoroethane and water: kinetics and equilibrium
Author(s) -
Nayak A. K.,
Sarkar S. K.
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:10<767::aid-kin5>3.0.co;2-k
Subject(s) - chemistry , deuterium , activation energy , hydrogen isotope , atmospheric temperature range , hydrogen , kinetics , kinetic isotope effect , hydroxide , fractionation , thermodynamics , chemical kinetics , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , atomic physics , physics , quantum mechanics
It is shown experimentally that pentafluoroethane undergoes rapid protium‐deuterium exchange with water in the presence of hydroxide ion. Addition of dimethylsulfoxide enhances the rate at least by a factor of 100. The first measured fractionation factor data are presented for the temperature range of 50–120°C. These values are compared with the theoretical estimations calculated by using isotopic reduced partition function ratios based on molecular vibrational frequencies. Although catalytic exchange is slow at ambient temperature, the reaction rate becomes measureable above around 60°C because of large activation energy (92 kJ/mole). Comparisons are made with similar data available for various halomethane and haloethane systems. © 1997 John Wiley & Sons, Inc.