Journal of Physical Chemistry p. 3988 - 3993 (1991)
Update date:2022-08-11
Topics:
Minami, Takahide
Tamai, Naoto
Yamazaki, Tomoko
Yamazaki, Iwao
The photochromic reaction of spiropyran <-> merocyanine has been studied with 1'-octadecyl-3',3'-dimethyl-6-nitrospiro<2H-1-benzopyran-2,2'-indoline> (SSP) incorporated in Langmuir- Blodgett (LB) films prepared in a mixed film with stearic acid, arachidic acid, and tripalmitine.Time-resolved fluorescence spectra and decay curves of SSP and its photoisomer, merocyanine (SMC), were measured with a picosecond time-correlated, single-photon-counting apparatus.When SSP in LB films was excited at 360 nm, two fluorescence bands were observed: one has a maximum at 660 nm, and the other has a relatively weak band at 530 nm.We assigned them respectively to the fluorescence band of SMC and an intermediate X as a precursor of SMC.The rigidity of the medium surrounding photochromic molecules is an important factor in determining the rate of reversible photoconversion of SSP <-> SMC.
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