AI Article Synopsis
- This research focuses on creating organometallic Borromean rings (BRs) and [2]catenanes using benzobiscarbene ligands through self-assembly with specific dinickel complexes and a bridging ligand.
- Solvophobic effects significantly influence both the formation and stability of these interlocked structures, with stability being enhanced by longer alkyl substituents on the precursors.
- An equilibrium between [2]catenanes and their building blocks is established in solution, and higher concentrations of [2]catenanes are favored in concentrated solutions or polar solvents, further improved by longer N-alkyl substituents.
Article 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 L 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 L . 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.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.202217681 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The codriven assembly of molecular metalla-links ([Formula: see text], [Formula: see text]) and metalla-knots ([Formula: see text], [Formula: see text]) via coordination and noncovalent interactions.
Proc Natl Acad Sci U S A
July 2024
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China.
Article Synopsis
- Researchers introduced a new method for assembling mechanically interlocked molecules (MIMs) using a combination of coordination and noncovalent interactions like π-π stacking and CH⋯π interactions to create complex structures like molecular links, knots, and Borromean rings.
- The assembly was achieved by utilizing specifically designed ligands combined with a certain type of organometallic clip, demonstrating how varying the size and properties of these components influenced the resulting molecular structures.
- This innovative approach not only provides a pathway for synthesizing intricate MIMs but also highlights the importance of noncovalent interactions in their formation, confirmed through various analytical techniques like NMR and X-ray diffraction.*
Selective Construction of Molecular Borromean Rings and [2]Catenane Utilizing Ether Bipyridyl Ligands.
Chemistry
May 2023
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China.
Article Synopsis
- * The research shows how varying the length of bipyridyl ligands can facilitate the transformation from a binuclear D-shaped ring to a tetranuclear [2]catenane.
- * Different naphthyl group positions on the bipyridyl ligand enable the selective synthesis of [2]catenane and Borromean rings under the same experimental conditions.
Organometallic Borromean Rings and [2]Catenanes Featuring Di-NHC Ligands.
Angew Chem Int Ed Engl
March 2023
Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149, Münster, Germany.
Article Synopsis
- This research focuses on creating organometallic Borromean rings (BRs) and [2]catenanes using benzobiscarbene ligands through self-assembly with specific dinickel complexes and a bridging ligand.
- Solvophobic effects significantly influence both the formation and stability of these interlocked structures, with stability being enhanced by longer alkyl substituents on the precursors.
- An equilibrium between [2]catenanes and their building blocks is established in solution, and higher concentrations of [2]catenanes are favored in concentrated solutions or polar solvents, further improved by longer N-alkyl substituents.
Selective Construction of Very Large Stacking-Interaction-Induced Molecular 8 Metalla-knots and Borromean Ring Using Curved Dipyridyl Ligands.
J Am Chem Soc
January 2021
Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry, Fudan University, Shanghai 200433, P.R. China.
Two molecular metalla-knots containing over 500 non-hydrogen atoms (especially 16 Rh ions) and one molecular Borromean ring were obtained in high yields facilitated by multiple intermolecular interactions between their components. The syntheses rely on the strategic selection of the nonlinear dipyridyl ligand 2,7-di(pyridin-4-yl)-9-fluorene () as precursor, and the structures of the assemblies were confirmed by detailed X-ray crystallographic analysis. Subsequently, replacing with the bulkier ligand 4,4'-(9,9-dimethyl-9-fluorene-2,7-diyl)dipyridine () led to the formation of three tetranuclear metallocycles in high yields on account of the weakened π-π stacking interactions between the naphthacene/anthracene and fluorene moieties, which in turn confirmed the significance of stacking interactions in the construction of the molecular 8 metalla-knots and the molecular Borromean ring.
View Article and Find Full Text PDFMolecular Borromean Rings Based on Half-Sandwich Organometallic Rectangles.
Acc Chem Res
September 2018
State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry , Fudan University, 2005 Songhu Road , Shanghai 200433 , China.
Over the last two decades, interlocked molecular species have received considerable attention, not only because of their intriguing structures and topological importance, but also because of their potential applications as smart materials, nanoscale devices, and molecular machines. Through judicious choice of metal centers and their adjoining ligands, a range of interesting interlocked structures have been realized by coordination-driven self-assembly. In addition, researchers have extensively developed synthetic methodologies for the construction of organized self-assemblies.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!