Novel AIE [2 + 2] Schiff base macrocycles containing a 2,6-pyridylimide skeleton: Self-assembly and Cu²⁺ sensing

Zhang, Qi Long; Zhou, Xu; Zhang, Xing; Shen, Lingyi; Xu, Hong; Wang, Zhi Yong; Huang, Chao; Redshaw, Carl; Zhu, Bi Xue

Abstract

Despite positive progress on the study of the supramolecular self-assembly of 2,6-diimidopyridine-containing macrocycles with interpenetrating or interlocking structures via anionic recognition and hydrogen bonding interactions between the pyridine imide group and the axial ligand, there are few studies on the assembly of micro-nanomaterials formed by non-covalent interactions between such molecules. Schiff base compounds containing 2,6-diacyliminopyridine units are also an excellent class of metal ion acceptor, and their structures can be easily modified and modulated to be widely used in metal ion probes. Based on previous studies, we obtained an AIE [2 + 2] Schiff base macrocyclic LCX containing 2,6-diimidopyridine units by a one-step condensation reaction. LCX has excellent AIE fluorescence properties, high affinity for Cu2+, and its binding to Cu2+ is not interfered by pH changes or co-existing metal ions. The detection limit is low at 242.00 nM. Electron microscopy experiments showed that the self-assemblies formed by LCX and Cu2+ were core–shell nano-microspheres with spiked surfaces. In addition, during the synthetic process, different nanosized nanospheres of uniform size were obtained by simply adjusting the ratio of water, thereby providing a new method for the synthesis of uniformly sized nanorods.

Citation

Zhang, Q. L., Zhou, X., Zhang, X., Shen, L., Xu, H., Wang, Z. Y., Huang, C., Redshaw, C., & Zhu, B. X. (2024). Novel AIE [2 + 2] Schiff base macrocycles containing a 2,6-pyridylimide skeleton: Self-assembly and Cu2+ sensing. Microchemical journal, 207, Article 112009. https://doi.org/10.1016/j.microc.2024.112009

• Journal Article Type: Article
• Acceptance Date: Oct 22, 2024
• Online Publication Date: Oct 28, 2024
• Publication Date: Dec 1, 2024
• Deposit Date: Nov 15, 2024
• Publicly Available Date: Oct 29, 2025
• Journal: Microchemical Journal
• Print ISSN: 0026-265X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 207
• Article Number: 112009
• DOI: https://doi.org/10.1016/j.microc.2024.112009
• Public URL: https://hull-repository.worktribe.com/output/4911447