title: Conformational Switching of π-Conjugated Junctions from Merocyanine to Cyanine States by Solvent Polarity.
abstract: Directed by the solvent polarity, the prevalent conformation of a polymethine dye bearing a branched π-conjugated junction can be switched from a heptamethine donor-acceptor (DA) merocyanine-type π-conjugated system to a nonamethine DAD cyanine-type π-conjugated scaffold. Concomitantly the absorption maximum shifts from 585 nm in dichloromethane to 748 nm in methanol solution.
authors.affiliation: Universität Würzburg, Institut für Organische Chemie and Center for Nanosystems Chemistry, Am Hubland, 97074, Würzburg, Germany.
authors.forename: Alhama
authors.initials: A
authors.lastname: Arjona-Esteban
authors.affiliation: Universität Würzburg, Institut für Organische Chemie and Center for Nanosystems Chemistry, Am Hubland, 97074, Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Stolte
authors.affiliation: Universität Würzburg, Institut für Organische Chemie and Center for Nanosystems Chemistry, Am Hubland, 97074, Würzburg, Germany. wuerthner@chemie.uni-wuerzburg.de.
authors.forename: Frank
authors.initials: F
authors.lastname: Würthner
keywords: conformation analysis; cyanines; dyes/pigments; solvatochromism