Photochromic reaction of microcrystalline 6-nitroindolinospiropyran studied by femtosecond diffuse reflectance spectroscopy

Mototsugu Suzuki, Tsuyoshi Asahi, Hiroshi Masuhara

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

Transient absorption spectra of 1′,3′,3′-trimethyl-6- nitrospiro[2H-1-benzopyran-2,2′-(2H)-indole] (6-nitro-BIPS) microcrystalline powder were measured by femtosecond diffuse reflectance spectroscopy and compared with those in the benzene solution and in a PMMA film. A very similar photochromic reaction occurs even in the crystal, although the structure of the generated photo-colored form in crystalline phase is not as planar as that of a stable form (trans-planar merocyanine) in solution. Photocoloration and the following thermal back reaction dynamics are considered in terms of free volume of the matrix and limited motion of the molecule.

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