title: Azacyanines of the pyrrolopyrrole series.
abstract: The reaction of POCl3-activated, readily soluble diketopyrrolopyrrole (DPP) with 2-aminoheteroaromatics to yield 1:1 and 1:2 hydrogen chelates is described. Complexation of these hydrogen chelates with boron reagents results in thermally and photochemically stable fluorescent dyes (PP-azacyanines). The 1:2 complexes in particular absorb at long wavelengths and are brightly fluorescing. The rich photophysics of the new compounds are presented. Both the pronounced vibrational fine structure of the S0 → S1 transitions and the observed fluorescence phenomena allow detailed conclusions to be made on the correlation between molecular structure and optical properties.
authors.affiliation: Fachbereich Chemie, Universität Konstanz, 78457 Konstanz (Germany), Fax: (+49) 7531-88-3139.
authors.forename: Timo
authors.initials: T
authors.lastname: Marks
authors.forename: Ewald
authors.initials: E
authors.lastname: Daltrozzo
authors.forename: Andreas
authors.initials: A
authors.lastname: Zumbusch
keywords: absorption; chromophores; dyes/pigments; fluorescence; photophysics