High-Order Host–Guest Complexation of Structurally Well-Defined Cycloparaphenylene Double-Deckers with Fullerenes
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Construction of high-order 2:2 complexes has not been reported for carbon nanohoop systems owing to the synthetic challenges of the host and the complexity of the binding process. In this work, a cycloparaphenylene double-decker host ( 1 ) was synthesized and its structure was determined by single-crystal analysis, revealing a trans -geometry and a self-assembled dimerization. Crystallographic studies and NMR/UV–vis titrations demonstrated the stepwise formation of a 1:2 complex between 1 and C 60 . For the complexation of 1 and C 120, a highly cooperative 2:2 complex was formed, exhibiting the formation constant K F = (1.2 ± 0.2) × 10 17 M –3; this complex disassembles into a 1:2 complex with the breaking constant K B = (1.6 ± 0.3) × 10 4 M –1 upon addition of excess C 120 . This distinctive binding–unbinding process is supported by single-crystal analysis, NMR titration, and diffusion-ordered NMR spectroscopy. The study highlights the potential of concave–convex π–π interactions in forming high-order complexes, which could facilitate the development of more sophisticated supramolecular architectures.
Source: Precision Chemistry
Authors: Xingchi Liu, Zhuofan Xu, Zhe Sun
Institution: Tianjin University
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: diamond
Awards: G364323989, G5292795869
OpenAlex ID: W4413994138