Abstract
Dibromomethane (CH 2Br 2) in acetonitrile is a suitable precursor to characterize the absorption signatures of the CH 2Br radical and solvent Br charge-transfer complexes. Following irradiation of CH 2Br 2 at 255 nm, the iso-H 2C Br Br isomer product rapidly converts back to the parent species, and transient absorption spectra reveal the bands of solvent-separated radical species, the CH 2Br radical peaking at 235 nm, as well as the CH 3CN·Br complex at 272 nm. The absorption of CH 2Br exhibits minor solvatochromic shifts upon going from acetonitrile to cyclohexane, and the molecular decadic extinction coefficient of CH 3CN·Br is estimated to be 1470 M −1 cm −1.
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