title: Efficient Photoswitch System Combining a Dimethyldihydropyrene Pyridinium Core and Ruthenium(II) Bis-Terpyridine Entities.
abstract: Terpyridine ruthenium complexes linked to the dimethyldihydropyrene (DHP) photochromic unit have been synthesized and fully characterized by cyclic voltammetry and absorption and emission spectroscopy. The study of the photoisomerization reaction undergone by the DHP motif under visible light irradiation is reported. In comparison to previous work, the introduction of an electron-withdrawing pyridinium spacer between the chelating terpyridine unit and the DHP skeleton has considerably tuned the photochromic properties of the free ligands and their corresponding complexes in term of time response and photoreversibility. A rapid, reversible, and complete conversion between the closed and the open forms has been clearly evidenced under visible light irradiation. Only slight perturbations have been induced by the presence of ruthenium centers. Experimental findings and their interpretation have been supported by theoretical calculations.
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Margot
authors.initials: M
authors.lastname: Jacquet
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.|Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Lafolet
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Saioa
authors.identifier: http://orcid.org/0000-0002-9353-3417
authors.initials: S
authors.lastname: Cobo
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Frédérique
authors.initials: F
authors.lastname: Loiseau
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Assil
authors.initials: A
authors.lastname: Bakkar
authors.affiliation: Laboratoire de Chimie et Physique Quantiques (UMR5626), CNRS et Université de Toulouse 3 , Toulouse, France.
authors.forename: Martial
authors.identifier: http://orcid.org/0000-0001-6684-5223
authors.initials: M
authors.lastname: Boggio-Pasqua
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Saint-Aman
authors.affiliation: Université Grenoble Alpes , DCM UMR 5250, F-38000 Grenoble, France.
authors.forename: Guy
authors.initials: G
authors.lastname: Royal