Copper and Nickel Complexes of Oxamate−Phenol Containing Ligands: A Structural Dichotomy in Oxidized Species

Author:

Wang Guanqi1,Moreau Yohann2,Berthiol Florian1,Philouze Christian1,Jarjayes Olivier1,Thomas Fabrice1ORCID

Affiliation:

1. Univ. Grenoble Alpes, CNRS DCM 38000 Grenoble France

2. Univ. Grenoble Alpes, CEA CNRS IRIG-LCBM 38000 Grenoble France

Abstract

AbstractThe copper and nickel complexes of two tetradentate ligands derived from bis(aminophenol) and bis(phenol) architectures connected by an oxamate linker were isolated. Depending on the metal and ligand, the complex is isolated with either an intact (deprotonated) ligand (12−), one‐electron oxidized ligand (2) or quinone form (3). Surprisingly, the Mannich base is easier to oxidize than the amidophenol derivatives. The complexes were characterized by X‐ray diffraction, cyclic voltammetry, UV‐Vis‐NIR and EPR spectroscopies. Complex 1 shows two reversible oxidation waves assigned to the successive iminosemiquinone/aminophenolate redox systems. Complex 2 shows an intense NIR feature, as well as an EPR signal at giso=2.043, consistent with a metallic contribution to the main ligand radical SOMO. Complex 3 shows the typical feature of an isolated Cu(II) complex. Spectro‐electrochemistry coupled to DFT calculations demonstrate a ligand‐centered oxidative redox chemistry for all the complexes.

Funder

Agence Nationale de la Recherche

LABoratoires d’EXcellence ARCANE

Publisher

Wiley

Subject

Inorganic Chemistry

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