Stimuli‐Responsive Complexation Based on Twisted Cucurbit[14]uril and p‐Diaminoazobenzene

Abstract

The supramolecular assembly between twisted cucurbit[14]uril (tQ[14]) and p‐diaminoazobenzene (DAAB) has been successfully developed based on host‐guest interactions. Interestingly, as the temperature increases, the assembly dissociates and recovers when the temperature decreases. This shows that the association and dissociation of the supramolecular assembly can be reversibly controlled by the temperature. In addition, the tQ[14]‐DAAB complex also exhibits selective ultraviolet and colorimetric responses for AcO− and F−, the detection limits of the sensor for AcO− and F− are 5.17×10−6 M and 2.31×10−5 M, respectively. The tQ[14]‐DAAB exhibits potential analysis applications.

Double-cavity cucurbiturils: synthesis, structures, properties, and applications

“…22(b)). 134 When tQ[14]–DAAB is stimulated by anions (F − , ACO − , Cl − , ClO 2 − , SO 4 2− , NO 3 − , Br − , I − , PF 6 − , H 2 PO 4 − , ClO 4 − , and HSO 4 − ), it exhibits responses to fluoride (F − ) and acetate (ACO − ) in water. The addition of F − or ACO − to the tQ[14]–DAAB solution leads to a colour change, observable to the unaided eye, from orange to yellow and a significant change in the UV-vis spectrum (Fig.…”

“…22(b)). 134 When tQ [14]-DAAB is stimulated by anions (F À , ACO À , Cl À , ClO 2 À , SO 4 2À , NO 3…”