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The complex photo-rearrangement of a heterocyclic N-oxide: Kinetics from picoseconds to minutes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27746 44041 2009 8 PDF Available
Title
The complex photo-rearrangement of a heterocyclic N-oxide: Kinetics from picoseconds to minutes
Abstract

The photo-induced rearrangement of 2-benzoyl-3-phenylquinoxaline-1,4-dioxide yielding 1,3-dibenzoylbenzimidazolone (DBBI) is studied by time-resolved fluorescence, UV/vis absorption, and IR spectroscopy. This complex rearrangement occurs on time scales ranging from 0.1 ps up to minutes. Processes within the excited singlet state(s) (0.1–1 ps) are followed by a multi-phasic depletion of the fluorescent states (time constants of 1–200 ps). During that depletion both a triplet state and a precursor of the photo-product are populated. In absence of oxygen the triplet state decays in 8 μs. It does not participate in the formation of the photoproduct. A process with a time constant of 77 min terminates the product formation. It can be assigned to a hindered rotation of the benzoyl residues in DBBI.

Keywords
Heteroaromatic N-oxides; Femtosecond spectroscopy; Fluorescence spectroscopy; UV/vis spectroscopy; IR spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 206, Issue 1, 5 July 2009, Pages 10–17
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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