Neutral and negatively charged anion receptors functioning in pure water are rare in supramolecular chemistry. Moreover, studies on adjusting the affinity of such receptors toward anions in water are absent from the literature. Two new bambusurils, 1 a and 2 a, were prepared to demonstrate that the affinity of bambusurils towards anions can be altered by the length of carboxyalkyl groups attached to the macrocycles. The stability of the bambusuril complexes was further controlled by the pH value. The crystal structure of bambusuril 1 a was described, in which two carboxyalkyl arms fold into the macrocycle cavity, thus forming the intramolecular self-inclusion complex.

CEITEC Central European Institute of Technology and National Centre for Biomolecular Research Masaryk University Kamenice 5 625 00 Brno Czech Republic

Department of Chemistry Masaryk University Faculty of Science Kamenice 5 625 00 Brno Czech Republic

RECETOX Research Centre for Toxic Compounds in the Environment Masaryk University Faculty of Science Kamenice 5 625 00 Brno Czech Republic

References provided by Crossref.org

Anion Transport by Bambusuril-Bile Acid Conjugates: Drastic Effect of the Cholesterol Content

Reversing selectivity of bambusuril macrocycles toward inorganic anions by installing spacious substituents on their portals

Unsubstituted Bambusurils: Post-Macrocyclization Modification of Versatile Intermediates