Premium
Primary steps in the photolysis of cis ‐1,2‐dichloroethylene
Author(s) -
Ausubel R.,
Wijnen M. H. J.
Publication year - 1975
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.550070510
Subject(s) - chemistry , photodissociation , excited state , wavelength , decomposition , photochemistry , radical , scavenging , primary (astronomy) , organic chemistry , atomic physics , astrophysics , optics , physics , antioxidant
The photolysis of cis ‐1,2‐dichloroethylene has been investigated in the presence of I 2 as a function of incident wavelength and as a function of initial cis pressure. The results indicate that at ± > 2200Å the following primary processes occur:\documentclass{article}\pagestyle{empty}\begin{document}$$ cis{\rm - 1,}2{\rm - C}_{\rm 2} {\rm H}_{\rm 2} {\rm Cl}_{\rm 2}^ * \to {\rm C}_{\rm 2} {\rm H}_{\rm 2} + {\rm Cl}_{\rm 2} $$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$ cis{\rm - 1,2 - C}_{\rm 2} {\rm H}_{\rm 2} {\rm Cl}_{\rm 2}^ * \to {\rm C}_{\rm 2} {\rm HCl} + {\rm HCl} $$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$ cis{\rm - 1,}2{\rm - C}_{\rm 2} {\rm H}_{\rm 2} {\rm Cl}_{\rm 2}^ * \to {\rm C}_{\rm 2} {\rm H}_{\rm 2} {\rm Cl} + {\rm Cl} $$\end{document}The lifetime of the excited state yielding the above products is estimated at about 2.4×10 −9 sec. At shorter wavelengths additional C 2 H 2 is produced by decomposition of a vibrationally excited C 2 H 2 Cl radical. Scavenging of the CHClCH radical by I 2 produced trans and cis ‐CHClCHl in a ratio of 4 to 1, respectively.