A significant enhancement in the proportion of the (P)-helical enantiome (see picture) of the tetrahedral copper(I)–bipyridine unit in a chiral pseudocrown ether occurs on complexation with an achiral alkali metal ion (M+). This dually responding system also works as an AND device for CD output by utilizing coordination and chiral information, with the Cu+ and Na+ ions acting as the input signals.
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Nabeshima et al. (2002) studied this question.
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