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From Dimeric to Octameric Metallo-Supramolecular Macrocycles Based on Sterically Congested Ligand-assisted Self-Assembly with Zn(II), Cd(II), and Fe(II).

Authors
  • Guan, Shengwen1
  • Yu, Hao1
  • Zhang, Zhe2
  • Jiang, Xin1
  • Shi, Junjuan1
  • Lu, Tong1
  • Wang, Chunyu1
  • Wang, Pingshan2
  • Wang, Ming1
  • 1 State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China. , (China)
  • 2 Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Environmental Research at Great Bay, Guangzhou University, Guangzhou, 510006, P. R. China. , (China)
Type
Published Article
Journal
Macromolecular rapid communications
Publication Date
Dec 01, 2020
Volume
41
Issue
24
Identifiers
DOI: 10.1002/marc.202000095
PMID: 32297375
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Two sterically congested 2,2':6',2″-terpyridine-based ligands LA and LB, composed of asymmetrically contiguous terpyridine units, are designed and synthesized for metallo-supramolecular architectures. The significant advantage of this design is that the terpyridines in these ligands have different chemical environments and show a selective coordination ability with each other. For ditopic ligand LA, the self-assembly with Zn(II), Cd(II), and Fe(II) gave the rhombic dimers, which have the same sets of terpyridine signals as ligand LA. The self-assembly behavior of tritopic ligand LB with Cd(II) and Zn(II) are observed for discrete tetramers under thermodynamic control, whereas ligand LB and Fe(II) are assembled to generate a mixture of tetramer, hexamer, and octamer, which are successfully isolated using regular chromatographic separation. Moreover, the sterically congested ligands and metal ions formed stable intermediates to drive the formation of discrete structures, which is also proved by mixing LB and Cd(II) with a precise stoichiometric ratio of 1:1. These supramolecular complexes are thoroughly characterized by NMR spectroscopy, electrospray ionization-mass spectrometry, and 2D traveling-wave ion mobility-mass spectrometry. This conceptually new design of sterically congested ligands provides a novel strategy for precisely controlled supramolecular complexes with diverse architectures. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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