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

Citation
M. Suzuki et al., Photochromic reaction of microcrystalline 6-nitroindolinospiropyran studied by femtosecond diffuse reflectance spectroscopy, MOLEC CRYST, 345, 2000, pp. 375-380
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Volume
345
Year of publication
2000
Pages
375 - 380
Database
ISI
SICI code
Abstract
Transient absorption spectra of 1',3',3'-trimethyl-6-nitrospiro[2H-1-benzop yran-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 react ion occurs even in the crystal, although the structure of the generated pho to-colored form in crystalline phase is not as planar as that of a stable f orm (trans-planar merocyanine) in solution. Photocoloration and the followi ng thermal back reaction dynamics are considered in terms of free volume of the matrix and limited motion of the molecule.