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Photodissociation of bromochlorobenzenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27721 44039 2008 5 PDF Available
Title
Photodissociation of bromochlorobenzenes
Abstract

The photodissociation kinetics of 2-, 3- and 4-bromochlorobenzene (BrClPh) and bromo-3,5-dichlorobenzene (Br-diClPh) have been studied in a molecular beam following excitation at 270 nm using femtosecond pump-probe spectroscopy. The kinetics and the dissociation dynamics in the BrClPhs were found to resemble the BrFPhs much more than the BrBrPhs. In 2- and 3-BrClPh two dissociation channels were observed, whereas 4-BrClPh and Br-3,5-diClPh dissociates via only one channel. The time constant for channel one, present in all molecules, depends on the number of chlorine atoms and their position. The absence of a second channel in 4-BrClPh is a general property among mixed Br-(Br, Cl or F)-Phs and is likely to be due to a dissociation channel involving a triplet excitation.

Keywords
Photodissociation; Substituent effects; Pump-probe spectroscopy; Molecular beam; Aryl halides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 195, Issues 2–3, 15 April 2008, Pages 242–246
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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