Strategies for the construction of supramolecular assemblies from poly-NHC ligand precursors

• 作者: Yang Li Jian-Gang Yu Li-Li Ma Man Li Yuan-Yuan An Ying-Feng Han
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: REVIEWS
• 页码范围: 701-718
• 页数: 18页
• 语种: 英文

摘要

The field of supramolecular assemblies has developed rapidly in the last few decades,thanks in a large part to their diverse applications.These assemblies have been mostly based on Werner-type coordination motifs in which metal centres are co-ordinated by nitrogen or oxygen donors.Recently,N-heterocyclic carbene (NHC) ligands have been employed as carbon donors not only because of their appealing structures but also due to the extensive applications in catalysis,biomedicine and material science of the resulting assemblies.During the last decade,NHC-based supramolecular assemblies have witnessed rapid growth and extensive application in molecular recognition,luminescent materials and catalysis.For different topological systems,a diverse selection ofpoly-NHC precursors and synthetic strategies is crucial to precisely control the synthesis of supramolecular architectures.Several synthetic strategies have been developed to synthesise two-dimensional (2D) molecular metallacycles and three-dimensional (3D) metallacages from a wide range of poly-NHC precursors,including a straightforward one-pot strategy,supramolecular transmetalation,stepwise synthesis,an improved one-pot strategy involving self-sorting behaviour of 3D me-tallacages and a subtle variation strategy of poly-NHC ligand precursors.This review offers a summary of the synthetic strategies applied for the construction of different poly-NHC-based supramolecular assemblies,particularly emphasizes recent progress in the synthesis of large and complex supramolecular assemblies from poly-NHC precursors,and further attention is given to their application in postsynthetic modifications (PSMs),host-guest chemistry,luminescent properties and biomedical applications.