The structure characteristics of photoproducts of indolinospirooxazines |
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Authors: | X Y Zhang S Jin Y C Liang Y F Ming L H Yu M G Fan W F Wang S D Yao |
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Institution: | 1. Department of Chemistry, Peking University, 100871, Beijing, China 2. Photochemistry Laboratory, Institute of Photographic Chemistry, Academia Sinica, 100101, Beijing, China 3. Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Academia Sinica, 201800, Shanghai, China
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Abstract: | Photochromic reactions of four indolinospirooxazine derivatives have been studied using nanosecond laser flash photolysis
techniques. Photolysis of the four compounds in acetonitrile and in cyclohexane all leads to the formation of the short-lived
CT intermediates as the predominant photoproducts. In certain circumstances few photomerocyanines (PMC) can be observed. From
the absorption bands and the lifetimes of CT intermediates, it has been speculated that the substituents at the nitrogen atom
of the indole ring influence the structural characteristics of CT intermediates mainly through steric hindrance effects, whereas
the substituents at the 5 position of the indoline ring influence mainly through electron effects. A potential energy surface
model is established to explain the results. |
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