Spectrokinetic studies of two 6,6a-dihydrochromeno(3,4-b) chromene derivatives

Abstract

Benzo and Naphthopyrans (chromenes) have been extensively studied since the discovery of photochromic reaction of 2H-1-benzopyrans in 1966 by Becker and Michl. Researchers have investigated chromenes for their use in sunglass lenses and also other potential applications such as optical memories and optical switches. Femto/picosecond and nano/microsecond experiments were released on two 6,6a-dihydrochromeno(3,4-b)chromene derivatives. After disappearance of the singlet state S₁ formed from each compound, photoproducts with short lifetime (2.2 to 21 ?s) obtained were attributed to the open forms.

Keywords: 6,6a-dihydrochromeno(3,4-b)chromene, photochromic, nano/microsecond domain, femto/picosecond domain, wavelength, lifetime.