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Heterocorrole Conformations: Little Saddling, Much Ruffling
Jörn Rösner1, Birte Cordes1, Stefanie Bahnmüller1
1Institute for Inorganic and Analytical Chemistry, TU Braunschweig, Hagenring 30, 38106, Braunschweig, Germany.
This study investigated metal complexes of heterocorroles, focusing on how the macrocycle cavity size adapts to different metal ions. Researchers found that corrole macrocycles can deform through in-plane bond lengthening and out-of-plane ruffling to accommodate metal ions.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Corrole macrocycles are versatile ligands in coordination chemistry.
- Understanding metal-ligand interactions is crucial for designing new materials.
- Previous studies suggested corroles do not significantly ruffle.
Purpose of the Study:
- To synthesize and characterize 10-heterocorrole complexes with various metal ions (Ni, Cu, Pd).
- To investigate the size adaptation mechanisms between the corrole cavity and metal ion radius.
- To explore the structural flexibility of corrole macrocycles.
Main Methods:
- Synthesis of novel 10-heterocorrole complexes.
- Single-crystal X-ray diffraction analysis.
- Structural analysis of metal-ligand interactions and macrocycle conformation.
Main Results:
- Complexes with oxygen, sulfur, and selenium at position 10 were prepared.
- X-ray data revealed the N4 binding site was generally larger than the metal ion.
- Effective in-plane size adaptation occurred via M-N bond elongation (2.5-3.2%).
- Pronounced out-of-plane macrocycle ruffling was observed for significant size mismatches.
Conclusions:
- Corrole macrocycles exhibit significant structural flexibility to accommodate metal ions.
- Out-of-plane ruffling is an efficient mechanism for size adaptation, even for small central ions.
- This flexibility challenges previous assumptions about corrole structural behavior.
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