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Hydrogen isotope exchange between pentafluoroethane and water: kinetics and equilibrium

✍ Scribed by A. K. Nayak; S. K. Sarkar

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
140 KB
Volume
29
Category
Article
ISSN
0538-8066

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✦ Synopsis

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 50-120ЊC. 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 60ЊC because of large activation energy

Comparisons are made with similar data available for various halome-(92 kJ/mole). thane and haloethane systems.

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