title: A multifunctional photoswitch: 6π electrocyclization versus ESIPT and metalation.
abstract: A terthiazole-based molecular switch associating 6π electrocyclization, excited state intramolecular proton transfer (ESIPT), and strong metal binding capability was prepared. The photochemical and photophysical properties of this molecule and of the corresponding nickel and copper complexes were thoroughly investigated by steady-state and ultrafast absorption spectroscopy and rationalized by DFT/TDDFT calculations. The switch behaves as a biphotochrome with time-dependent photochemical outcome and displays efficient ESIPT-based fluorescence photoswitching. Both photochemical reactions are suppressed by nickel or copper metalation, and the main factors contributing to the quenching of the electrocyclization are discussed.
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182, Université Paris-Sud, Bât. 420, 91405 Orsay Cedex (France), Fax: (+33) 169-15-4754.
authors.forename: Juliette
authors.initials: J
authors.lastname: Guérin
authors.forename: Anne
authors.initials: A
authors.lastname: Léaustic
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Delbaere
authors.forename: Jérôme
authors.initials: J
authors.lastname: Berthet
authors.forename: Régis
authors.initials: R
authors.lastname: Guillot
authors.forename: Cyril
authors.initials: C
authors.lastname: Ruckebusch
authors.forename: Rémi
authors.initials: R
authors.lastname: Métivier
authors.forename: Keitaro
authors.initials: K
authors.lastname: Nakatani
authors.forename: Maylis
authors.initials: M
authors.lastname: Orio
authors.forename: Michel
authors.initials: M
authors.lastname: Sliwa
authors.forename: Pei
authors.initials: P
authors.lastname: Yu
keywords: density functional calculations; femtosecond chemistry; intramolecular proton transfer; metalation; photochromism