title: New fluorescent bis-dithienylethene (DTE)-based bipyridines as reverse interrupters: single vs. double photochromism.
abstract: The synthesis and characterization of a series of fluorescent bis-dithienylethene (DTE)-based bipyridines, where the donor (D) and acceptor (A) groups are located on the same thiophene ring of the DTE unit, and their zinc(II) and rhenium(I) complexes are reported. Their photochromic properties have been investigated by UV-visible and (1)H NMR spectroscopy. These studies reveal that in non-polar solvents it is possible to modulate the photoreactivity, single vs. double ring-closure, by changing the nature of the donor group. The solvent effect, as well as the influence of the organometallic moieties on the photochromic behavior of these molecules, is also discussed. Finally, upon photoconversion to the photostationary state (PSS), a quenching of fluorescence is observed for the bipyridine ligands, due to disruption of the conjugation upon ring-closing.
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France. lebozec@univ-rennes1.fr veronique.guerchais@univ-rennes1.fr.
authors.forename: Lucie
authors.initials: L
authors.lastname: Ordronneau
authors.forename: Julien
authors.initials: J
authors.lastname: Boixel
authors.forename: Vincent
authors.initials: V
authors.lastname: Aubert
authors.forename: Matias S
authors.initials: MS
authors.lastname: Vidal
authors.forename: Sergio
authors.initials: S
authors.lastname: Moya
authors.forename: Pedro
authors.initials: P
authors.lastname: Aguirre
authors.forename: Loic
authors.initials: L
authors.lastname: Toupet
authors.forename: J A Gareth
authors.initials: JA
authors.lastname: Williams
authors.forename: Hubert
authors.initials: H
authors.lastname: Le Bozec
authors.forename: Véronique
authors.initials: V
authors.lastname: Guerchais