Impact of vibrational excitation on the kinetics of a nascent ketene

文献情報

出版日 2009-11-05

DOI 10.1039/B915451E

インパクトファクター 3.676

著者

Thomas Schmierer, Wolfgang J. Schreier, Florian O. Koller, Tobias E. Schrader

原文を見る

要旨

The formation and decay of a ketene intermediate photochemically formed from o-nitrobenzaldehyde has been studied by femtosecond UV/Vis and IR spectroscopy. The ketene is formed predominantly within a few 100 fs and to a minor extent within ∼200 ps via the recombination of a triplet phased bi-radical. In tetrahydrofuran solution the ketene intermediate is seen to form a secondary intermediate with biphasic kinetics. The first phase of this decay occurs within a few picoseconds. It can be attributed to the reaction of vibrationally excited ketenes. The second phase characterized by a time constant of 2 ns is due to the reaction of thermalized molecules. In 2-butanol solution the lifetime of the thermalized ketene is only ∼60 ps and the rapid and the slow phases of the decay start to merge.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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