title: Reversible Photomodulation of Electronic Communication in a π-Conjugated Photoswitch-Fluorophore Molecular Dyad.
abstract: The extent of electronic coupling between a boron dipyrromethene (BODIPY) fluorophore and a diarylethene (DAE) photoswitch has been modulated in a covalently linked molecular dyad by irradiation with either UV or visible light. In the open isomer, both moieties can be regarded as individual chromophores, while in the closed form the lowest electronic (S0 →S1 ) transition of the dyad is slightly shifted, enabling photomodulation of its fluorescence. Transient spectroscopy confirms that the dyad behaves dramatically different in the two switching states: while in the open isomer it resembles an undisturbed BODIPY fluorophore, in the closed isomer no fluorescence occurs and instead a red-shifted DAE behavior prevails.
authors.affiliation: Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany.
authors.forename: Javier
authors.initials: J
authors.lastname: Moreno
authors.affiliation: Institute of Physical and Theoretical, Goethe-Universität Frankfurt, Max-von-Laue Strasse 7, 60438, Frankfurt/M., Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Schweighöfer
authors.affiliation: Institute of Physical and Theoretical, Goethe-Universität Frankfurt, Max-von-Laue Strasse 7, 60438, Frankfurt/M., Germany. wveitl@theochem.uni-frankfurt.de.
authors.forename: Josef
authors.initials: J
authors.lastname: Wachtveitl
authors.affiliation: Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany. sh@chemie.hu-berlin.de.
authors.forename: Stefan
authors.initials: S
authors.lastname: Hecht
keywords: BODIPY; diarylethenes; fluorescence; photochromism; time-resolved spectroscopy