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A low temperature luminiscence study of the colored merocyanine form of substituted 6-nitrobenzo-spiropyrans

Authors
Journal
Journal of Photochemistry and Photobiology A Chemistry
1010-6030
Publisher
Elsevier
Publication Date
Volume
67
Issue
3
Identifiers
DOI: 10.1016/1010-6030(92)87006-u

Abstract

Abstract The emission spectra of colored merocyanine forms of substituted 6-nitrobenzospiropyrans ( 1-4)were studied at 77 K. The merocyanine form obtained by UV irradiation of a solution of spiropyrans at room temperature is a dynamic equilibrium mixture of stable trans forms. The merocyanine form obtained by UV irradiation of the same solution at 77 K is a short- lived intermediate. The assignment of this short-lived intermediate to the trans-cis-cis (TCC) form is based on MM2 calculations. This TCC intermediate was also observed during the visible light irradiation of the hydrochloric acid salt form of 1 (5) prepared at 197 K.

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