Real-time observation of concerted benzene formation in the infrared multiphoton dissociation of 1,4-cyclohexadiene

Kumar, Awadhesh ; Chowdhury, P. K. ; Rama Rao, K. V. S. ; Mittal, J. P. (1991) Real-time observation of concerted benzene formation in the infrared multiphoton dissociation of 1,4-cyclohexadiene Chemical Physics Letters, 182 (2). pp. 165-170. ISSN 0009-2614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/000926...

Related URL: http://dx.doi.org/10.1016/0009-2614(91)80122-E

Abstract

The infrared-multiphoton dissociation of 1,4-cyclohexadiene opens up two dissociation channels from its ground electronic state. The major dehydrogenation channel ( > 95%) gives benzene and hydrogen whereas the retro-Diels-Alder reaction channel produces 1,3-butadiene and acetylene. The temporal evolution of benzene as a photoproduct is monitored. From the real-time formation of benzene, a unimolecular dissociation rate for 1,4-cyclohexadiene has been found to be (1.0± 0.15) × 106 s-1. The UV spectrum of nascent benzene reveals a red-shift of 8 nm. The effects of laser energy and substrate pressure on dissociation yield are also investigated.

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