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- Title
Organometallic Borromean Rings and [2]Catenanes Featuring Di‐NHC Ligands.
- Authors
Lu, Ye; Dutschke, Patrick D.; Kinas, Jenny; Hepp, Alexander; Jin, Guo‐Xin; Hahn, F. Ekkehardt
- Abstract
We report herein a series of organometallic Borromean rings (BRs) and [2]catenanes prepared from benzobiscarbene ligands. The reaction of dinickel complexes of the benzobiscarbenes 1 a–1 c with a thiazolothiazole bridged bipyridyl ligand L2 led by self‐assembly to a series of organometallic BRs. Solvophobic effects played a crucial role in the formation and stability of the interlocked species. The stability of BRs is related to the N‐alkyl substituents at the precursors 1 a–1 c, where longer alkyl substitutes improve stability and inter‐ring interactions. Solvophobic effects are also important for the stability of [2]catenanes prepared from 1 a–1 c and a flexible bipyridyl ligand L3. In solution, an equilibrium between the [2]catenanes and their macrocyclic building blocks was observed. High proportions of [2]catenanes were obtained in concentrated solutions or polar solvents. The proportion of [2]catenanes in solution could be further enhanced by lengthening of the N‐alkyl substitutes.
- Subjects
CATENANES; POLAR solvents; BIPYRIDINE; SUPRAMOLECULAR chemistry
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 11, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202217681