AI Article Synopsis
- Broadband UV-visible femtosecond transient absorption spectroscopy was used to study the excited state behavior of CH(2)BrI after being excited by specific wavelengths in 2-butanol.
- The research found that one-photon excitation at 266 or 271 nm produced iso-CH(2)Br-I similarly to previous studies, indicating C-I bond cleavage.
- Conversely, two-photon excitation at 395 nm led to the formation of iso-CH(2)I-Br and demonstrated a blueshifted absorption band, highlighting the difference in bond cleavage mechanisms.
Article Abstract
Broadband UV-visible femtosecond transient absorption spectroscopy was used to monitor the excited state photochemistry of CH(2)BrI following one-photon excitation at 266 or 271 nm and two-photon excitation at 395 or 405 nm in 2-butanol. The results for one-photon excitation agree with earlier studies in acetonitrile, showing clear formation of iso-CH(2)Br-I following cleavage of the C-I bond. In contrast, two-photon excitation at 395 nm results in the appearance of a blueshifted photoproduct absorption band assigned to formation of iso-CH(2)I-Br following cleavage of the C-Br bond. The results are discussed in the context of prior experimental and theoretical work and the prospects for optical control of bond cleavage.
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| http://dx.doi.org/10.1063/1.3374680 | DOI Listing |
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