Binaphthyl-Bipyridyl Cyclic Dyads as a Chiroptical Switch.
J Am Chem Soc
; 140(16): 5334-5338, 2018 04 25.
Article
em En
| MEDLINE
| ID: mdl-29652488
ABSTRACT
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 [α]D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes.
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MEDLINE
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En
Ano de publicação:
2018
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Article