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Citation: Qi Xiurong, Yu Qun, Shou Hansen, Fan Mei ng, Li Zhongjie. LIGHT INDUCED ISOMERIZATION OF ORGANIC COMPOUNDS Ⅹ. Studies on Transient Absorption Spectra of Indolinospiropyrans[J]. Acta Physico-Chimica Sinica, ;1989, 5(06): 677-680. doi: 10.3866/PKU.WHXB19890607 shu

LIGHT INDUCED ISOMERIZATION OF ORGANIC COMPOUNDS Ⅹ. Studies on Transient Absorption Spectra of Indolinospiropyrans

1.
Institute of Photographic Chemistry; Academia Sinica; Beijing; Department of Chemistry; Northwest University; Xian

Received Date: 16 May 1988
Available Online: 15 December 1989

Transient absorption spectra in the photocolouration of 1-n-octyl-3,3-dimethylindolino-2,2'-spiro-5',6'-(2-bromo-4-nitro-benzo)-pyran (SPP1), 1-n-octyl-3,3-dimethyl-indolinn-2,2'-spiro-5',6'-(4-nitro-benzo)-pyran (SPP2), 1-n-octyl-3,3-dimethylindolino-2,2'-spiro-5', 6'-(2, 4-dinitro-benzo)-pyran (SPP3) and 1-n-octyl-3,3-dimethylindolino-2,2'-spiro-5', 6'-(2-chloro-4-nitro-benzo)-pyran (SPP4) in toluene and eyclohexane were investigated with nanosecond laser photolysis. Several certain intermediats and an aggregate were observed. The mechanism of the isomerization involves not lnly triplet process but also singlet process.
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