Organometallic Borromean Rings and [2]Catenanes Featuring Di‐NHC Ligands

Author:

Lu Ye1,Dutschke Patrick D.1,Kinas Jenny1,Hepp Alexander1,Jin Guo‐Xin2ORCID,Hahn F. Ekkehardt1ORCID

Affiliation:

1. Institut für Anorganische und Analytische Chemie Westfälische Wilhelms-Universität Münster Corrensstrasse 30 48149 Münster Germany

2. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Department of Chemistry Fudan University Shanghai 200438 P. R. China

Abstract

AbstractWe 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 a1 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 a1 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 a1 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.

Funder

Deutsche Forschungsgemeinschaft

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Medicine

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