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Late-stage Ligand Modification After Coordination Strengthens Stereoselectively Self-Assembled Hemiaminal Ether
Sakthi Raje1, Abhishek Koner1, Suchismita Ghosh1
1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
Chemistry, an Asian Journal
|September 1, 2023
Summary
Researchers modified koneramine ligands within copper(II) complexes, converting fragile hemiaminal ether bonds into stable methylene linkages. This late-stage modification retained the coordination sphere, demonstrating a versatile method for creating new metal complexes.
Area of Science:
- Coordination Chemistry
- Organic Synthesis
- Materials Science
Background:
- Koneramines (LR OR') are tridentate ligands featuring hemiaminal ether linkages.
- These ligands form stereoselectively self-assembled syn-[Cu(LR OR')X2 ] complexes with copper(II).
- Hemiaminal ether linkages are known for their inherent fragility.
Purpose of the Study:
- To investigate the late-stage modification of koneramine ligands after coordination.
- To transform fragile hemiaminal ether linkages into robust methylene linkages.
- To synthesize new rac-[Cu(LR H)Cl2 ] complexes while maintaining the coordination sphere.
Main Methods:
- Stereoselective self-assembly of koneramine ligands with copper(II).
- Late-stage chemical modification of the coordinated ligand's hemiaminal ether bonds.
- Characterization of the resulting metal complexes using various analytical techniques.
Main Results:
- Successful conversion of hemiaminal ether linkages to methylene linkages in copper(II) complexes.
- Formation of stable rac-[Cu(LR H)Cl2 ] complexes.
- Retention of the coordination sphere during the ligand modification process.
Conclusions:
- Late-stage ligand modification is an effective strategy for enhancing the stability of koneramine-metal complexes.
- The developed method allows for the synthesis of new, robust metal complexes with retained coordination environments.
- The stereoselective self-assembly of koneramine complexes is general and applicable to various metal ions, anions, amines, alcohols, and thiols.
Keywords:
DipicolylamineLate stage ligand modificationMolecular EvolutionPrebiotic synthesisTemplate synthesisMore Related Videos
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