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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
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201510620
Subject(s) - merocyanine , cyanine , conjugated system , solvent polarity , chemistry , photochemistry , polarity (international relations) , dichloromethane , solvent , solvatochromism , absorption (acoustics) , materials science , organic chemistry , photochromism , fluorescence , polymer , biochemistry , physics , quantum mechanics , 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.