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Transient absorption investigation of the photophysical properties of new photochromic 3H‐naphtho[2,1‐b]pyran
Author(s) -
Moine B.,
Buntinx G.,
Poizat O.,
Rehault J.,
Moustrou C.,
Samat A.
Publication year - 2007
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.1185
Subject(s) - photochromism , ultrafast laser spectroscopy , pyran , photochemistry , nanosecond , chemistry , excited state , absorption (acoustics) , singlet state , ring (chemistry) , spectroscopy , femtosecond , absorption spectroscopy , materials science , stereochemistry , physics , laser , atomic physics , optics , organic chemistry , quantum mechanics , composite material
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. Copyright © 2007 John Wiley & Sons, Ltd.