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

Mototsugu Suzuki, Tsuyoshi Asahi, Hiroshi Masuhara

Research output: Contribution to journalConference article

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.

Original languageEnglish
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume345
StatePublished - 1 Dec 2000
Event3rd International Symposium on Organic Photochromism (ISOP99) - Fukuoka, Jpn
Duration: 14 Nov 199918 Nov 1999

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