Abstract
Abstract Time-resolved resonance Raman and absorption spectra have revealed that three transients are involved in the photochromic reaction of 6-nitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indoline] in the ns - μs time region. The firstly appearing transient is identified as the lowest excited triplet state T1. The secondly appearing transient is assignable to the photomerocyanine generated from the T1 state by the cleavage of the C(spiro)-O bond of the spiropyran ring, and the lastly appearing transient is considered to be a dimeric species of the photomerocyanine.
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