An anionic three-way switch: A bipyridyl bis(urea)-based anion receptor that is highly selective for dihydrogen phosphate demonstrates spectroscopically distinct anion-bound conformations toward halides and select oxoanions. 1H NMR studies show the differing anion-induced conformations are reversible allowing this system to function as a three-way molecular switch.
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Gavette et al. (2013) studied this question.
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