title: Theoretical and Experimental Study on Boron β-Diketonate Complexes with Intense Two-Photon-Induced Fluorescence in Solution and in the Solid State.
abstract: Three boron diketonate chromophores with extended π-conjugated backbone were prepared and their spectroscopic features were investigated through a combined theoretical/experimental study. It was shown that these complexes, which undergo very large electronic reorganization upon photoexcitation, combine large two-photon absorption cross section with an emission energy and quantum efficiency in solution that is strongly dependent on solvent polarity. The strong positive influence of boron complexation on the magnitude of the two-photon absorption was clearly established, and it was shown that the two-photon absorption properties were dominated by the quadrupolar term. For one of the synthesized compounds, intense one- and two-photon-induced solid-state emission (fluorescence quantum yield of 0.65 with maximum wavelength of 610 nm) was obtained as a result of antiparallel J-aggregate crystal packing.
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France.
authors.forename: Pierre-Henri
authors.initials: PH
authors.lastname: Lanoë
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France.
authors.forename: Bastien
authors.initials: B
authors.lastname: Mettra
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France.
authors.forename: Yuan Yuan
authors.initials: YY
authors.lastname: Liao
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Calin
authors.affiliation: CINAM UMR CNRS 7325, Université Aix-Marseille, Campus de Luminy, Case 913, 13288, Marseille, France. daleo@cinam.univ-mrs.fr.
authors.forename: Anthony
authors.initials: A
authors.lastname: D'Aléo
authors.affiliation: IFMRI, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Namikawa
authors.affiliation: IFMRI, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kamada
authors.affiliation: CINAM UMR CNRS 7325, Université Aix-Marseille, Campus de Luminy, Case 913, 13288, Marseille, France.
authors.forename: Fréderic
authors.initials: F
authors.lastname: Fages
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France. cyrille.monnereau@ens-lyon.fr.
authors.forename: Cyrille
authors.initials: C
authors.lastname: Monnereau
authors.affiliation: Laboratoire de Chimie UMR CNRS 5182, Ecole Normale Supérieure de Lyon/Université de Lyon, 46, Allée d'Italie, 69007, Lyon, France. chantal.andraud@ens-lyon.fr.
authors.forename: Chantal
authors.initials: C
authors.lastname: Andraud
keywords: boron; chromophores; fluorescence; solid-state emission; theoretical calculations