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Photochromic Properties of New Benzoindene‐Fused 2 H ‐Chromenes
Author(s) -
Martins Cristina I.,
Coelho Paulo J.,
Carvalho Luis M.,
OliveiraCampos Ana M. F.,
Samat André,
Guglielmetti Robert
Publication year - 2003
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/hlca.200390057
Subject(s) - photochromism , bathochromic shift , chemistry , benzopyrans , absorption (acoustics) , photochemistry , stereochemistry , fluorescence , optics , physics
The synthesis and the photochromic properties of new photochromic 6,7‐ and 7,8‐benzoindene annellated benzopyrans are described. When compared to parent indeno‐fused 2 H ‐chromenes (2 H ‐[1]benzopyrans), compounds 10 and 12 exhibit a significant bathochromic shift of maximum‐absorption wavelength, an increase in the colorability, and similar fading rates.