title: Photophysics of aminophenyl substituted pyrrolopyrrole cyanines.
abstract: A series of novel pyrrolopyrrole cyanines (PPCys) bearing various aminophenyl substituents at the diketopyrrolopyrrole (DPP) core are presented. Compared to their alkoxyphenyl substituted analogues, these dyes feature additional intense electronic transitions of charge-transfer character which give detailed insight into the optical properties of PPCys. The energetic mixing of the involved orbitals has pronounced effects on the absorption and fluorescence behavior. Protonation of the amino function suppresses these effects and leads to a pronounced increase in fluorescence quantum yield. The photophysics of the dyes can be rationalized by means of a simple energy scheme.
authors.affiliation: Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Wiktorowski
authors.forename: Georg M
authors.initials: GM
authors.lastname: Fischer
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Winterhalder
authors.forename: Ewald
authors.initials: E
authors.lastname: Daltrozzo
authors.forename: Andreas
authors.initials: A
authors.lastname: Zumbusch
mesh_terms: D008027:Light; D009682:Magnetic Resonance Spectroscopy; D011758:Pyrroles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D011758:Pyrroles