Photochromic Properties of New Benzoindene-Fused 2H-Chromenes
作者:Cristina I. Martins、Paulo J. Coelho、Luis M. Carvalho、Ana M. F. Oliveira-Campos、André Samat、Robert Guglielmetti
DOI:10.1002/hlca.200390057
日期:2003.3
The synthesis and the photochromicproperties of newphotochromic 6,7- and 7,8-benzoindene annellated benzopyrans are described. When compared to parent indeno-fused 2H-chromenes (2H-[1]benzopyrans), compounds 10 and 12 exhibit a significant bathochromic shift of maximum-absorption wavelength, an increase in the colorability, and similar fading rates.