Study on the host-guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe3

Jun Zheng; Lian An; Jie Gao; Lin Zhang; Xinan Yang; Weiwei Zhao; Siyuan Cheng; Peihua Ma

doi:10.1098/rsos.211280

Study on the host-guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe³

R Soc Open Sci. 2021 Dec 22;8(12):211280. doi: 10.1098/rsos.211280. eCollection 2021 Dec.

Authors

Jun Zheng¹, Lian An¹, Jie Gao¹, Lin Zhang¹, Xinan Yang¹, Weiwei Zhao¹, Siyuan Cheng¹, Peihua Ma¹

Affiliation

¹ Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, People's Republic of China.

Abstract

This paper has selected dicyclohexanocucurbit[6]uril (CyH₂Q[6]) as the host and 2-phenylbenzimidazole (G) as the guest to investigate the host-guest interaction mode between CyH₂Q[6] and G. Under acidic conditions, the complex was characterized using nuclear magnetic resonance, ultraviolet and fluorescence spectroscopy. The results show that the molecular ratio of CyH₂Q[6] to G is 2 : 1. The crystals were cultured with ZnCl₂ as a structural inducer under acidic conditions and single crystal X-ray diffraction showed that the molecular ratio of CyH₂Q[6] to G is 1 : 3. The G@CyH₂Q[6] was used as a fluorescent probe to identify metal cations. The probe exhibits a good selective recognition effect toward Fe³⁺ ions, which involves a reduced fluorescence intensity with a limit of detection of 1.321 × 10^-6 mol l^-1.

Keywords: 2-phenylbenzimidazole; CyH2Q[6]; host–guest interaction; ion recognition; limit of detection.