Zinc Schiff Base Complexes Derived from 2,2'‐Diaminobiphenyls: Solution Behavior and Reactivity towards Nitrogen Bases

Zn complexes of Schiff base ligands derived from 2,2'‐diaminobiphenyls and salicylaldehyde derivatives were synthesized and characterized by NMR and single‐crystal X‐ray diffraction analysis. The detailed NMR studies suggest that the Zn complexes have a complicated behavior in solution, which i...

Full description

Saved in:
Bibliographic Details
Published in:European journal of inorganic chemistry 2020-10, Vol.2020 (38), p.3627-3643
Main Authors: Hylland, Knut Tormodssønn, Øien‐Ødegaard, Sigurd, Heyn, Richard H., Tilset, Mats
Format: Article
Language:English
Subjects:
2,2'‐Diaminobiphenyls
Cadmium
Comparative studies
Coordination compounds
Coordination numbers
Imines
Inorganic chemistry
Ligands
Nitrogen bases
NMR
Nuclear magnetic resonance
Schiff base ligands
Solvents
Synthesis
X-ray diffraction
Zinc
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Zn complexes of Schiff base ligands derived from 2,2'‐diaminobiphenyls and salicylaldehyde derivatives were synthesized and characterized by NMR and single‐crystal X‐ray diffraction analysis. The detailed NMR studies suggest that the Zn complexes have a complicated behavior in solution, which is strongly dependent on the donating ability of the solvent, the steric properties of the ligand, as well as the concentration of the complex in the solvent. All these factors are decisive for the determination of the coordination number of the complex in solution. Furthermore, pentacoordinated Zn complexes of the aforementioned type, ligated by a series of nitrogen bases, were synthesized. NMR studies of the different complexes at different concentrations and temperatures, revealed information about their conformational stability. The differences were further examined by single‐crystal X‐ray diffraction analysis. In addition to the studies conducted on Zn complexes, comparative studies were conducted on a series of Cd complexes. Zn complexes of Schiff base ligands derived from 2,2'‐diaminobiphenyls were synthesized and studied by NMR. The complexes showed a complicated behavior in solution, strongly dependent on the nature of the solvent, the substitution pattern on the aromatic rings, and the concentration of the complexes. Similar behavior was observed in studies of the corresponding base‐ligated Zn complexes, obtained by reaction with different nitrogen bases.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202000589