Novel anti-[2.3](3,10)phenanthrenophane 3, prepared by the intramolecular [2 + 2] photocycloaddition of 1,3-bis(3-vinyl-10-phenanthryl)propane, exhibited monomer fluorescence. This is in a remarkable contrast with the excimer fluorescence emission from anti-[2.3](3,9)phenanthrenophane 2 with slightly larger overlap between phenanthrene rings than in anti-3.
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Nakamura et al. (2001) studied this question.
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