Formation and Infrared Spectrum of the Open-Form 2-Bromoethyl Radical (2-C2H4Br·) from Ultraviolet Irradiation of a C2H4/Br2/ p-H2Matrix

Yu Hsuan Chen, Yueh Kuei Cheng, Yuan-Pern Lee*

*Corresponding author for this work

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Abstract

The addition reaction of halogens to alkenes is important in organic synthesis, but the reaction intermediate has rarely been detected. Whether the structure of the intermediate bromoethyl (C2H4Br·) radical is a bridged form or an open form is unclear. We took advantage of the diminished cage effect of solid p-H2 and employed infrared (IR) absorption to record the IR spectrum of C2H4Br· after photolysis of a C2H4/Br2/p-H2 matrix at 254 nm, followed by annealing. New spectral features at 676.9, 776.7, 1068.5, 1148.0, 3041.8, and 3126.8 cm-1 are assigned to the open-form 2-bromoethyl radical, according to their photolytic behavior and comparison with scaled harmonic vibrational wavenumbers and IR intensities calculated with the B2PLYPD3/6-311++G(2df,2p) method.

Original languageEnglish
JournalJournal of Physical Chemistry A
DOIs
StatePublished - Mar 2021

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