Premium
The kinetics of free radical chain reactions in solutions of trichlorofluorethylene in cyclohexane
Author(s) -
Horowitz A.,
MeyMarom A.,
Rajbenbach L. A.
Publication year - 1974
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/kin.550060206
Subject(s) - chemistry , cyclohexane , radical , reaction rate constant , kinetics , ternary operation , adduct , photochemistry , bond dissociation energy , dissociation (chemistry) , chain reaction , atmospheric temperature range , thermodynamics , organic chemistry , physics , quantum mechanics , computer science , programming language
The kinetics of the gamma‐radiation‐induced free radical chain reaction in solutions of C 2 Cl 3 F in cyclohexane (RH) was investigated over a temperature range of 87.5–200°C. The following rate constants and rate constant ratios were determined for the reactions:\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {{\rm (2a)}} & {{\rm R} + {\rm C}_{\rm 2} {\rm Cl}_{\rm 3} {\rm F} \to {\rm RCClFCCl}_{\rm 2}} \\ \end{array}$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {(2{\rm b})} & \to \\ \end{array}{\rm RCCl}_{\rm 2} {\rm CClF}$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c}{{\rm (3a)}} & {{\rm RCClFCCl}_{\rm 2} \to {\rm RCF}}\\ \end{array}{\raise1pt\hbox{$\Relbar \kern-4pt{\Relbar}$}}{\rm CCl}_{\rm 2} + {\rm Cl}$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {{\rm (4a)}} & {{\rm RCClFCCl}_{\rm 2} + {\rm RH} \to {\rm RCClFCCl}_{\rm 2} {\rm H} + {\rm R}} \\ \end{array}$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log {\rm }k_{2a} ({\rm mole}^{{\rm - 1}} 1.\,{\rm sec}^{{\rm - 1}}) = (8.64 \pm 0.35) - (6.38 \pm 0.41)/\theta ^1$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log {\rm }k_{{\rm 2b}} /k_{{\rm 2a}} = (- 0.03 \pm 0.15) - (2.39 \pm 0.28)/\theta$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log {\rm (}k_{3{\rm a}} /k_{4{\rm a}})({\rm mole}\,1.^{{\rm - 1}}) = (6.17 \pm 0.10) - (10.14 \pm 0.18)/\theta$$\end{document} In competitive experiments in ternary solutions of C 2 Cl 4 and C 2 Cl 3 F in cyclohexane the rate constant ratio k 2c / k 2a was determined\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {{\rm (2c)}} & {{\rm R} + {\rm C}_{\rm 2} {\rm Cl}_{\rm 4} \to {\rm RC}_{\rm 2} {\rm Cl}_{\rm 4}} \\ \end{array}$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log {\rm }k_{{\rm 2c}} /k_{{\rm 2a}} = (0.13 \pm 0.06) - (1.20 \pm 0.12)/\theta$$\end{document} By comparing with previous data for the addition of cyclohexyl radicals to other chloroethylenes it is shown that in certain cases the trends in activation energies for cyclohexyl radical addition can be correlated with the CCl bond dissociation energies in the adduct radicals.