Exciplex emission from styrene. Aliphatic amine adducts in a supersonic jet

Drescher, Wolfgang; Kendler, Shai; Zingher, E.; Haas, Yehuda

doi:10.1016/0009-2614(94)00539-7

Cited by 11 publications

(2 citation statements)

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“…However, in contrast with the situation in the jet, thermal reactivation may take place, so the exciplex may contribute to the formation of final products by this indirect manner. The detection of longlived (τ ) 400-800 ns) exciplex emission from styrenesecondary amines in the jet 68 is significant in this context. The absence of exciplex emission from these systems in the bulk is easily accounted for by the presence of competing deactivation processes.…”

Section: Discussionmentioning

confidence: 99%

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Styrene Clusters in a Supersonic Jet: Reactive and Nonreactive Systems

Kendler

Haas

1997

J. Phys. Chem. A

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Clusters of styrene with several atoms and small molecules were prepared and studied in a supersonic jet by laser-induced fluorescence (LIF) from S1 and resonance-enhanced multiphoton ionization (REMPI) using S1 as the resonant intermediate state. The dissociation limit can be determined in many cases (e.g., for argon, CO2, and ammonia) by recording the excess energy at which fluorescence from the cluster disappears and styrene fluorescence appears. Parent ion signals are easily observable from clusters excited to energies exceeding the dissociation threshold in S1, as determined by LIF. This indicates a relatively long lifetime of the electronically excited cluster on the ionization time scale. The styrene−trimethylamine system, which is reactive in liquid solution, exhibits a very different fluorescence behavior than all others. Two 1:1 styrene−trimethylamine clusters are observed by fluorescence excitation. One of them exhibits locally excited emission upon absorption near the origin, but at higher excitation energies, the emission is exciplex-type. The other shows exciplex emission at all excitation energies, including the 0−0 band. The data indicate at least two nonradiative processes competing with exciplex formation and with its radiative decay. The relation to solution phase photochemistry is discussed.

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Section: Discussionmentioning

confidence: 99%

“…Indeed, preliminary experiments published some time ago reported for the first time fluorescence due to a styrene−secondary amine adduct that could be characterized as due to an exciplex. The emission was weak, as expected, but distinct.…”

Section: Introductionmentioning

confidence: 99%