The effect of a sulphur bridge on the photochromic properties of indeno-fused naphthopyrans

abstract

The synthesis of four new 2,2-diphenyl-2H-naphtho[1,2-b]pyrans with a fused indeno group at the f face and a sulphur junction between the 2,2-phenyl groups is described. The photochromic properties in solution of these novel compounds were investigated under continuous irradiation. Compared to known indeno-fused naphthopyrans, these new compounds showed a significant bathochromic shift in the spectra of the open forms, faster ring closure kinetics and an expected decrease in the colourabilities. (C) 2004 Elsevier Ltd. All rights reserved.

keywords

BEHAVIOR

subject category

Chemistry

authors

Coelho, PJ; Salvador, MA; Oliveira, MM; Carvalho, LM

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