A Photoswitchable Chloride‐Binding [2]Rotaxane

Chemistry - A European Journal, vol. 31, pp. e202500461

Abstract

Abstract Control over the binding properties of anion receptors by external stimuli can be advantageous in various applications such as extraction and transport processes. Toward a light‐responsive anion receptor with high binding affinity and selectivity, a stiff‐stilbene photoswitch is incorporated into the macrocycle of a mechanically interlocked, chloride‐binding [2]rotaxane structure. UV‐Vis and 1 H NMR studies show reversible transformation between Z / E ‐isomers upon light irradiation, causing changes in motional dynamics and binding affinity. Photoswitching also takes place in the presence of chloride, as monitored by 1 H NMR spectroscopy, which results in its concomitant uptake and release. Our results show the suitability of rotaxanes as light‐responsive ion receptors, which could serve as prototypes for supramolecular pumps.

Authors 2

1. Jorn de Jong Aachen Leiden Institute of Chemistry, NETHERLANDS

   Leiden University

   Affiliation as printed

   Leiden Institute of Chemistry Leiden University Einsteinweg 55, 2333 CC Leiden The Netherlands

   Leiden University: Universiteit Leiden, Leiden Institute of Chemistry, NETHERLANDS, KINGDOM OF THE

2. Sander J. Wezenberg corresponding Aachen Leiden Institute of Chemistry

   Leiden University

   Affiliation as printed

   Leiden Institute of Chemistry Leiden University Einsteinweg 55, 2333 CC Leiden The Netherlands

   Universiteit Leiden, Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, NETHERLANDS, KINGDOM OF THE