Electrochemical generation and in situ EPR- and UV–vis- observation of aminyl-radical diarylamido/bis(phosphine) pincer complexes of Ni, Pd and Pt

Electrocatalytic radical degradation of 2-aminoethanol by nickel, palladium and platinum complexes bearing non-innocent diarylamido/bis(phosphine) pincer ligand

“…The previously described electrochemical procedure was used to obtain aminyl radical complexes 1 + -3 + [42]. ESR spectroscopy was employed to examine the interaction between aminyl radical complexes and MEA.…”

“…Thus, bis[2-(di-i-propylphosphino)-4-methylphenyl]amido complexes 1-3 can be considered as mediators of 2-aminoethanol electrooxidation, acting as soft oxidizing agents, leading to the formation of glycolic acid by a radical mechanism, operating under electrocatalytic conditions. Their electrochemical oxidation yields the aminyl radical species 1 + -3 + which unpaired electron is localized on the pincer-type PNP ligand [42]. These species oxidize MEA initiating its transformation into less toxic glycolic acid and restoring 1-3.…”

“…Recently, we have reported the electrochemical properties of bis[2-(di-i-propylphosphino)-4-methylphenyl]amido complexes [(PNP)MCl] of Ni (1), Pd (2) and Pt (3) (Fig. 2) [42]. The reversible oxidation of all complexes 1-3 leads to the aminyl radical species 1 + -3 + , wherein the unpaired electron is mostly localized on the pincer-type PNP ligand.…”