Syntheses, Structures, and Solution Studies of Multicomponent Macrocycles and Cages Based on Versatile Ligands
Ying-Ying Zhang1,2, Wen-Xi Gao1, Yue-Jian Lin1
1Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China.
New multinuclear rhodium macrocycles and cages were synthesized using hydroxamate ligands. Researchers observed varying nuclearities and structures depending on ligand size and reaction conditions, yielding diverse metal-organic frameworks.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Hydroxamate ligands offer versatile coordination sites for metal complex formation.
- Multinuclear metal complexes and macrocycles are of interest for their unique structural and functional properties.
Purpose of the Study:
- To design and synthesize novel multinuclear half-sandwich rhodium macrocycles and cages.
- To investigate the influence of ligand structure and reaction conditions on the nuclearity and assembly of metal-organic frameworks.
Main Methods:
- Synthesis of rhodium-based multinuclear complexes using pyrazine-2-hydroxamic acid (NaHL 1 ) and 4,4 '-bipyridine-2-hydroxamic acid (KHL 2 ) ligands.
- Construction of RhIII -PdII heterometallic macrocycles using palladium(II) sources.
- Assembly of cuboid-shaped cages using palladium(II) nitrate.
- Characterization of silver(I)-containing mixed-metal complexes using various spectroscopic techniques.
Main Results:
- A single type of macrocycle was formed with the shorter ligand (L 1 ).
- Coexistence of hexanuclear and octanuclear macrocycles was observed with the larger ligand (L 2 ), with proportions dependent on concentration and temperature.
- Cuboid-shaped cages and decanuclear silver(I) complexes with different symmetries (C2v , C2h , and D2 ) were successfully synthesized.
Conclusions:
- The choice of hydroxamate ligand and palladium source significantly influences the self-assembly of multinuclear metal-organic architectures.
- Ligand length and reaction parameters control the nuclearity and structural diversity of the resulting macrocycles and cages.
- This work demonstrates a versatile approach to constructing complex multinuclear metal assemblies with tunable structures.
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