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Cobalt(II) coordination to an N 4 -acenaphthene-based ligand and its sodium complex.
- Source :
-
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2023 Jun 13; Vol. 52 (23), pp. 7876-7884. Date of Electronic Publication: 2023 Jun 13. - Publication Year :
- 2023
-
Abstract
- A new bifunctional N <subscript>4</subscript> -ligand was obtained via the condensation reaction of acenaphthenequinone and 2-picolylamine. A peculiarity of this synthesis is the formation of a new intramolecular C-C bond during the reaction. The structure and redox properties of the ligand were studied. The anion-radical form of the ligand was prepared via the chemical reduction of the latter with metallic sodium as well as in situ via its electrochemical reduction in a solution. The sodium salt prepared was structurally characterized using single-crystal X-ray diffraction (XRD). New cobalt complexes with the ligand in neutral and anion-radical forms were synthesized and further studied. As a result, three new homo- and heteroleptic cobalt(II) complexes were obtained, in which the cobalt atom demonstrates different modes of coordination with the ligand. Cobalt(II) complex CoL <subscript>2</subscript> with two monoanionic ligands was prepared by the electrochemical reduction of a related L <subscript>2</subscript> CoBr <subscript>2</subscript> complex or by treating cobalt(II) bromide with the sodium salt. XRD was used to study the structures of all cobalt complexes prepared. Magnetic and electron paramagnetic resonance studies were performed: Co <superscript>II</superscript> ion states with S = 3/2 and S = 1/2 were found for the complexes. A quantum-chemical study confirmed that the spin density is mainly located at the cobalt center.
Details
- Language :
- English
- ISSN :
- 1477-9234
- Volume :
- 52
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Dalton transactions (Cambridge, England : 2003)
- Publication Type :
- Academic Journal
- Accession number :
- 37212425
- Full Text :
- https://doi.org/10.1039/d3dt00347g