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Oligothiophene‐Linked Bisnaphthopyrans: Sequential and Temperature‐Dependent Photochromism
Author(s) -
Zhao Weili,
Carreira Erick M.
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600958
Subject(s) - photochromism , substituent , linker , photochemistry , kinetics , quantum yield , yield (engineering) , materials science , chemistry , stereochemistry , optics , computer science , physics , composite material , fluorescence , quantum mechanics , operating system
Photochromic bisnaphthopyrans linked with oligothiophenes were synthesized and their photochromic behavior studied. Sequential and temperature‐dependent photochromism was observed in the oligothiophene linked bisnaphthopyrans. The kinetics of photo and thermal processes in bisnaphthopyrans in comparison with naphthopyrans were studied. Substituent and linking effects on the photochromic properties are discussed. We demonstrate that the cross‐talk between the two photochromophores is dependent on the length of the oligothiophene linker. The presence of the bithiophene linker led to high colorability and high quantum yield of coloration.