Photochromic Properties of New Benzoindene??Fused 2H??Chromenes

…, LM Carvalho, AMF Oliveira??Campos…

Index: Martins, Cristina I.; Coelho, Paulo J.; Carvalho, Luis M.; Oliveira-Campos, Ana M.F.; Samat, Andre; Guglielmetti, Robert Helvetica Chimica Acta, 2003 , vol. 86, # 3 p. 570 - 578

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Citation Number: 22

Abstract

Abstract 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 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.

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