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Weak fluorescences from [2.2]metacyclophane (MCP) were observed: the normal and intramolecular excimer fluorescences were at 305 and 361 nm respectively. It has been shown that a rapid radiationless deactivation due to the interaction between the two benzene rings in MGP occurs preferentially and the excimer formation responsible for the photocyclization takes place to a small extent.
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Shizuka et al. (1975) studied this question.
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