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Fluorescent H‐Aggregates of Merocyanine Dyes
Author(s) -
Rösch Ulrich,
Yao Sheng,
Wortmann Rüdiger,
Würthner Frank
Publication year - 2006
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.200602286
Subject(s) - merocyanine , fluorescence , photochemistry , dimer , j aggregate , fluorescent light , chemistry , materials science , optics , molecule , physics , photochromism , organic chemistry
Unexpected lighting up : A slight rotational twist and rigidification of merocyanine dyes in a face‐to‐face π ‐ π ‐ stacked dimer aggregate resulted in an unexpected increase in the fluorescence intensity and lifetime (see graph). This result contrasts the common perception that the fluorescence of H‐aggregates is strongly quenched, but can be rationalized within the concept of exciton theory.