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The Photochemistry of o ‐Nitrobenzaldehyde as Seen by Femtosecond Vibrational Spectroscopy
Author(s) -
Laimgruber Stefan,
Schreier Wolfgang J.,
Schrader Tobias,
Koller Florian,
Zinth Wolfgang,
Gilch Peter
Publication year - 2005
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200501642
Subject(s) - ketene , photoexcitation , photochemistry , femtosecond , picosecond , resonance raman spectroscopy , chemistry , raman spectroscopy , spectroscopy , resonance (particle physics) , laser , atomic physics , excited state , physics , optics , medicinal chemistry , quantum mechanics
A ketene comes and goes : The first intermediate in the photoredox reaction of o ‐nitrobenzaldehyde ( 1 ) is identified as ketene 2. In a femtosecond IR experiment a resonance at 2100 cm −1 corresponding to the ketene stretching vibration appears less than one picosecond after photoexcitation. The 90‐ps decay of this band is a manifestation of a nucleophilic addition to the CC double bond, which is supported by other spectroscopic experiments (IR and Raman).