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Using Rigidity and Conjugation of Subunits to Modulate Supramolecular Topologies Constructed by Half-Sandwich

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Summary

Researchers developed a method to control supramolecular structures, transforming metal macrocycles into Borromean rings. Ligand properties significantly impact synthesis and topological conversion efficiency.

Keywords:

Borromean rings Coordination-driven self-assembly Half-sandwich iridium Supramolecular coordination chemistry Topology

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Area of Science:

Supramolecular Chemistry
Coordination Chemistry
Materials Science

Background:

Controllable synthesis of complex supramolecular architectures remains a significant challenge.
Targeted modulation of topological transitions in molecular systems requires precise design strategies.

Purpose of the Study:

To construct discrete supramolecular structures with controllable topological transitions.
To investigate the influence of ligand characteristics on macrocycle formation and transformation.
To develop a strategy for converting tetranuclear metal macrocycles into Borromean rings.

Main Methods:

Synthesis of discrete supramolecular structures using bidentate pyridyl ligands (L1, L2, L3) and half-sandwiched (Cp*Ir fragments) building blocks.
Coordination of ligand lengths and building blocks to achieve specific concentrations for topological transformation.
Detailed structural analyses including π-π stacking, electron-donating capabilities, and hydrogen-bonding interactions.

Main Results:

Successfully constructed discrete supramolecular structures and achieved the transformation of tetranuclear metal macrocycles into Borromean rings.
Demonstrated that ligand length and specific concentrations are key to driving the topological conversion.
Identified π-π stacking, ligand electron-donating properties, and hydrogen bonding as critical for stabilizing macrocycles and facilitating Borromean ring formation.

Conclusions:

The study presents a viable strategy for the controlled synthesis and topological transformation of supramolecular macrocycles.
Ligand design, particularly the electron-rich effect of sulfur atoms and pyridine functional group modulation, is crucial for structural stability and altered characteristics.
The findings provide insights into the rational design of complex supramolecular systems with tunable topological properties.