The photophysical and photochemical properties of two 3,3‐diphenyl‐3H‐naphtho[2,1‐b]pyrans substituted in position 8 by phenylethynyl and p ‐nitrophenylethynyl groups, respectively, are investigated by femtosecond and nanosecond transient absorption spectroscopy. The spectral characteristics and dynamics of the lowest excited singlet and triplet states are determined. The ring‐opening reaction responsible for the photochromism is observed to occur in the S 1 state.
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Moine et al. (2007) studied this question.
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