ISSN:
1573-9171
Keywords:
photochemical reaction
;
chlorine
;
bromine
;
ethylene
;
cryochemistry
;
IR spectra
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Photolysis of a halogen in solid 1:1 molecular complexes of ethylene with chlorine (1) and bromine (2) at 18–70 K led to the formation oftrans-1,2-dihaloethanes by a chain mechanism (with quantum yields of 25–30 for 1 and 10–12 for 2 atT≤45 K) but molecular addition occurred above 90 K to give thegauche isomer. The rate constant for chain growth is independent of temperature atT≤45 K, but is described by the Arrhenius equation atT≥50 K (E 0 ≃ 1 kcal/mole). It is proposed that chain growth occurs by a tunneling reaction of the C2H4Hal radical with an Hal2 molecule at a neighboring lattice site.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00863807
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