Transient in the photocolouration of salicylidene m-bromoanil

Abstract

The fluorescence produced by excitation of the enol form of salicylidene m-bromoanil has been investigated with time- and wave-resolved picosecond fluorescence spectrum. The fluorescence is composed of two resolvable components. Due to the observation of around 1000 cm-1 Starkes red shift from the long wavelength lmax of the enol anil, both species could not be assigned to the excited enol anil. The initially formed species, the Moebius-like transition, is rapidly converted into the keto-anil form. Since the lifetime of the latter species is 121 times longer than that of the former, the total emission spectrum is dominated by the longer lived species. Thus, the time required to complete the 1, 5 antarafacial H transfer is equal to the rise time of the keto-anil fluorescence, i.e. 5 ?10-11 s. A reaction mechanism with two possible pathways to the ground state of the keto-anil has been suggested.

Key words: BENZAMINE P, PHOTOCHEMICAL REACTION, REACTION MECHANISM, BROMOHYDROCARBON, SALICYLIC ACID P, FLUOROSPECTROPHOTOMETRY

CLC Number:

O644

Cite this article

WU GUOSHENG;GE MINGJUAN;LIN GUANGCAN;HU JUN;SHU JUPING. Transient in the photocolouration of salicylidene m-bromoanil[J]. Acta Chimica Sinica, 1991, 49(2): 193-198.

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