Photoisomerization and photodissociation of aniline and 4-methylpyridine

Chien-Ming Tseng, Yuri A. Dyakov, Cheng Liang Huang, Alexander M. Mebel, Sheng Hsien Lin, Yuan T. Lee, Chi Kung Ni*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Photoisomerization and photodissociation of aniline and 4-methylpyridine at 193 nm were studied separately using multimass ion imaging techniques. Photofragment translational energy distributions and dissociation rates were measured. Our results demonstrate that more than 23% of the ground electronic state aniline and 10% of 4-methylpyridine produced from the excitation by 193 nm photons after internal conversion isomerize to seven-membered ring isomers, followed by the H atom migration in the seven-membered ring, and then rearomatize to both methylpyridine and aniline prior to dissociation. The significance of this isomerization is that the carbon, nitrogen, and hydrogen atoms belonging to the alkyl or amino groups are involved in the exchange with those atoms in the aromatic ring during the isomerization.

Original languageEnglish
Pages (from-to)8760-8768
Number of pages9
JournalJournal of the American Chemical Society
Issue number28
StatePublished - 21 Jul 2004


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