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Conformational Switching of π‐Conjugated Junctions from Merocyanine to Cyanine States by Solvent Polarity
Author(s) -
ArjonaEsteban Alhama,
Stolte Matthias,
Würthner Frank
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201510620
Subject(s) - merocyanine , cyanine , conjugated system , solvent polarity , polarity (international relations) , solvent , photochemistry , dichloromethane , chemistry , solvatochromism , absorption (acoustics) , materials science , organic chemistry , fluorescence , photochromism , polymer , biochemistry , optics , physics , composite material , cell
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.