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Synthesis of Photochromic Dyes Based on Annulated Coumarin Systems
Author(s) -
Cerqueira Nuno M. F. S. A.,
OliveiraCampos Ana M. F.,
Coelho Paulo J.,
de Carvalho Luís H. Melo,
Samat André,
Guglielmetti Robert
Publication year - 2002
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/1522-2675(200202)85:2<442::aid-hlca442>3.0.co;2-9
Subject(s) - photochromism , chemistry , coumarin , photochemistry , flash photolysis , fluorescence , absorption (acoustics) , photodissociation , organic chemistry , optics , kinetics , physics , quantum mechanics , reaction rate constant
Novel 2 H ‐chromenes derived from hydroxycoumarins were synthesized, and their photochromic behaviour was studied under flash‐photolysis conditions, showing a wide absorption range in the visible region. All the compounds exhibit low fluorescence, which apparently has no negative effect on their photochromic properties.