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Published on: December 16, 2013
Dimeric versus polymeric coordination in copper(II) cationic complexes with bis(chelating) oxime and amide ligands
Andrii I Buvailo1, Elzbieta Gumienna-Kontecka, Svetlana V Pavlova
1Department of Chemistry, National Taras Shevchenko University, 01601, Kiev, Ukraine.
New copper(II) complexes were synthesized using novel oxime and amide ligands. Dimeric structures were favored over polymeric ones due to stabilizing intramolecular hydrogen bonds, demonstrating supramolecular isomerism.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Copper(II) complexes are crucial in catalysis and materials science.
- Ligand design influences complex structure and properties.
- Understanding self-assembly in metal-organic frameworks is key.
Purpose of the Study:
- To synthesize and characterize novel copper(II) complexes with oxime and amide ligands.
- To investigate the solid-state structures, including dimeric and polymeric forms.
- To explore the role of ligand structure and hydrogen bonding in supramolecular assembly.
Main Methods:
- Synthesis of copper(II) complexes with ligands: H(2)pen, H(2)pap, H(2)papt, H(2)pah, and H(2)pahp.
- Characterization using spectroscopic methods (e.g., IR, UV-Vis) and X-ray structure analysis.
- pH-potentiometric studies to determine solution species.
Main Results:
- Formation of both binuclear dimeric and 1D-polymeric structures in the solid state.
- Bis-bidentate coordination of ligands to Cu(2+) forming planar CuN(2)O(2) fragments.
- Isolation of [Cu(Hpap)(ClO(4))(H(2)O)](x) in both dimeric (x=2) and polymeric (x=n) states, showcasing supramolecular isomerism.
- Stabilization by intramolecular hydrogen bonds favoring dimerization over polymerization.
Conclusions:
- Ligand structure and intramolecular hydrogen bonding dictate the formation of dimeric versus polymeric copper(II) complexes.
- The study provides insights into supramolecular isomerism in coordination compounds.
- Polymethylene linker length influences dimer conformation.
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