Abstract
Microsecond and nanosecond flash photolysis was used to study the photochromic reactions of spiropyrans of the indoline series 1′,3′,3′-trimethyl-6-nitro, 6-nitro-8-methoxy, 6-methoxyspiro[2 H-1-benzopyran-2′,2′-(2 H)-indol] in acetone in the presence of the acids HNO 3, HCl and H 2SO 4. Two relatively unstable trans isomers of spiropyran (merocyanine form) were found to be involved in the protolytic reaction. A reaction mechanism is proposed.
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