title: Wavelength-dependent reactivity of a quinolinone: toward a photochromic three-state system.
abstract: The photochemical reactivity of the quinolinone 3 was investigated using NMR by monitoring its reactions under appropriate irradiation wavelengths. Besides the irreversible formation of degradation products which were structurally identified, the reversible formation of the enol 4 and cyclobutenol 5 was also observed. The enol and cyclobutenol can be switched or reversed back to the quinolinone 3, resulting in a photochromic three-state system in which the relative ratio of the three components largely depends on the irradiation wavelength used.
authors.affiliation: CNRS UMR 8009, Lille 2 University, NMR and Photochemistry team, F-59006 Lille Cedex, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Berthet
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Micheau
authors.forename: Vladimir
authors.initials: V
authors.lastname: Lokshin
authors.forename: Magali
authors.initials: M
authors.lastname: Vales
authors.forename: Gaston
authors.initials: G
authors.lastname: Vermeersch
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Delbaere