An All-Halogen Bonding Rotaxane for Selective Sensing of Halides in Aqueous Media

作者：Mullaney Benjamin R; Thompson Amber L; Beer Paul D^*

来源：Angewandte Chemie - International Edition, 2014, 53(43): 11458-11462.

DOI：10.1002/anie.201403659

• anions
• halogen bonding
• noncovalent interactions
• rotaxanes
• supramolecular chemistry

The synthesis and anion binding properties of the first rotaxane host system to bind and sense anions purely through halogen bonding, is described. Through a combination of polarized iodotriazole and iodotriazolium halogen bond donors, a three-dimensional cavity is created for anion binding. This rotaxane incorporates a luminescent rhenium(I) bipyridyl metal sensor motif within the macrocycle component, thus enabling optical study of the anion binding properties. The rotaxane topology was confirmed by single-crystal X-ray structural analysis, demonstrating halogen bonding between the electrophilic iodine atoms and chloride anions. In 50% H2O/CH3CN solvent mixtures the rotaxane host exhibits strong binding affinity and selectivity for chloride, bromide, and iodide over a range of oxoanions.

• 出版日期2014-10-20