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Anion Modulated Expression of Chirality in Hydrogen Bond Templated Mechanically Chiral [2]Rotaxanes

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Article numbere202203502
<mark>Journal publication date</mark>13/04/2023
<mark>Journal</mark>Chemistry - A European Journal
Issue number21
Number of pages8
Publication StatusPublished
Early online date5/01/23
<mark>Original language</mark>English


The syntheses of two novel mechanically chiral rotaxanes containing urea and squaramide motifs (in yields of 33 % and 22 %, respectively) are presented. 1H NMR spectroscopic titrations reveal shuttling of the macrocycle – detectable by modulation of the expression of mechanical chirality in the NMR spectrum – is possible through the addition of achiral chloride anions, a process which is reversed by the addition of sodium cations.