title: Photoisomerisation in Aminoazobenzene-Substituted Ruthenium(II) Tris(bipyridine) Complexes: Influence of the Conjugation Pathway.
abstract: Transition-metal complexes containing stimuli-responsive systems are attractive for applications in optical devices, photonic memory, photosensing, as well as luminescence imaging. Amongst them, photochromic metal complexes offer the possibility of combining the specific properties of the metal centre and the optical response of the photochromic group. The synthesis, the electrochemical properties and the photophysical characterisation of a series of donor-acceptor azobenzene derivatives that possess bipyridine groups connected to a 4-dialkylaminoazobenzene moiety through various linkers are presented. DFT and TD-DFT calculations were performed to complement the experimental findings and contribute to their interpretation. The position and nature of the linker (ethynyl, triazolyl, none) were engineered and shown to induce different electronic coupling between donor and acceptor in ligands and complexes. This in turn led to strong modulations in terms of photoisomerisation of the ligands and complexes.
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France).|Laboratoire de Thermodynamique et Modélisation Moléculaire, USTHB, BP 32 El Alia, 16111 Bab Ezzouar Alger (Algeria).
authors.forename: Anissa
authors.initials: A
authors.lastname: Amar
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France).
authors.forename: Paul
authors.initials: P
authors.lastname: Savel
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France).
authors.forename: Huriye
authors.initials: H
authors.lastname: Akdas-Kilig
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France). claudine.katan@univ-rennes1.fr.
authors.forename: Claudine
authors.initials: C
authors.lastname: Katan
authors.affiliation: Laboratoire de Thermodynamique et Modélisation Moléculaire, USTHB, BP 32 El Alia, 16111 Bab Ezzouar Alger (Algeria).
authors.forename: Hacène
authors.initials: H
authors.lastname: Meghezzi
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France).
authors.forename: Abdou
authors.initials: A
authors.lastname: Boucekkine
authors.affiliation: Institut de Science des Matériaux de Mulhouse, UMR CNRS 7361, Université de Haute-Alsace, 15, rue Jean Starcky, 68057 Mulhouse (France). jean-pierre.malval@uha.fr.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Malval
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France). jean-luc.fillaut@univ-rennes1.fr.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Fillaut
keywords: azo compounds; density functional calculations; isomerisation; photochromism; ruthenium