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A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3'-bipyridyl, was synthesized. The dyad 2 bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a | glum| of 1.6 × 10-3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer 4 exhibited a dextro/ levo rotation switching ability in αD. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes.
Takaishi et al. (Fri,) studied this question.
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