title: Production and excited state dynamics of the photorearranged isomer of benzyl chloride and its methyl derivatives studied by stepwise two-color laser excitation transient absorption and time-resolved thermal lensing techniques.
abstract: Production and photoexcited dynamics of reaction intermediates with photolyses of benzyl chloride (BzCl) and methyl-substituted benzyl chlorides (MeBzCls) were studied by using stepwise two-color laser excitation transient absorption (TC-TA) and two-color laser excitation time-resolved thermal lensing (TC-TRTL) measurements. With photoexcitation of BzCl the formation of transient photorearranged isomer was suggested in the previous paper [Res. Chem. Intermed. 2001, 27, 137]. Such an isomer formation for MeBzCls was also observed in a 248 nm excitation. It was found that further photoexcitation of the isomers with the 308 nm light caused photodissociation to yield the corresponding benzyl radicals. The reaction quantum yield and the molar absorptivity of the photorearranged isomer of BzCl were estimated. The heat of reaction for the photodissociation of the isomer was successfully determined with the TC-TRTL measurement. These experimental results were consistent with MO calculations.
authors.affiliation: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Mika
authors.initials: M
authors.lastname: Nagano
authors.forename: Tadashi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Teijiro
authors.initials: T
authors.lastname: Ichimura
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Okutsu
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hiratsuka
authors.forename: Susumu
authors.initials: S
authors.lastname: Kawauchi