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. 2016 Feb 29;7:10742. doi: 10.1038/ncomms10742

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(a) Azo-TrEG@CD·2Br aqueous solution upon addition of PWV⁴⁻ (from 0 to 0.7 equivalents), and (b) intensity plots of Cotton signals at 360 and 440 nm versus the molar ratio of PWV⁴⁻ to Azo-TrEG@CD²⁺.