Transition-Metal Complexes with Mono- and Bi- Dentate Oxime Ligands
Start Date
April 2024
Location
2nd floor - Library
Abstract
Ligands with oxime functional groups are noted for their ability to stabilize normally inaccessible oxidation states, such as nickel (III) or copper (III). Previous efforts in our group have focused on tetradentate ligands with three oxime groups. Here we present our work with mono- and bi- dentate ligands having one or two oxime functional groups (see figure).
To date, four ligands have been synthesized and characterized by 1H-NMR spectroscopy. Also, complexes with one Fe(II) salt, one Co(II) salt, one Ni(II) salt, and three different Cu(II) salts have been synthesized. These complexes have been characterized via pronounced color changes and by UV-vis Spectroscopy.
Oxidations of these complexes have been attempted using Ammonium Cerium(IV) salts, Ammonium Persulfate, and Hydrogen Peroxide. To date, two metal centers, Co(IV) and Ni(III), have been confirmed, by the magnetic susceptibility balance, to be stabilized in their respective higher oxidation states by the bidentate oxime ligand.
Transition-Metal Complexes with Mono- and Bi- Dentate Oxime Ligands
2nd floor - Library
Ligands with oxime functional groups are noted for their ability to stabilize normally inaccessible oxidation states, such as nickel (III) or copper (III). Previous efforts in our group have focused on tetradentate ligands with three oxime groups. Here we present our work with mono- and bi- dentate ligands having one or two oxime functional groups (see figure).
To date, four ligands have been synthesized and characterized by 1H-NMR spectroscopy. Also, complexes with one Fe(II) salt, one Co(II) salt, one Ni(II) salt, and three different Cu(II) salts have been synthesized. These complexes have been characterized via pronounced color changes and by UV-vis Spectroscopy.
Oxidations of these complexes have been attempted using Ammonium Cerium(IV) salts, Ammonium Persulfate, and Hydrogen Peroxide. To date, two metal centers, Co(IV) and Ni(III), have been confirmed, by the magnetic susceptibility balance, to be stabilized in their respective higher oxidation states by the bidentate oxime ligand.
