Oxidation of nickel(II) bis(salicylaldimine) complexes: Solvent control of the ultimate redox site

Structural and electrochemical characterisation of [Pd(salen)]-type conducting polymer films

“…The monomeric complexes [Pd were prepared as described elsewhere [9]. Reagents and solvents for synthesis were obtained from Merck and Aldrich.…”

“…[M(salen)]-type complexes (M = transition metal) have been studied in this context due to the robustness of the salen ligand and its ability to coordinate several transition metal centres [7]. Since the first studies of poly[M(salen)] (M = Ni, Cu) modified electrodes by Goldsby and co-workers [8][9][10], several groups have explored these polymers [11][12][13][14][15][16][17][18][19][20][21][22]. Despite detailed electrochemical and spectroscopic studies, there is no consensus concerning the mechanism of electronic conduction.…”

Understanding the Charge Storage Mechanism and Electrochemical Performance on the Poly[Ni(salen)]-modified Electrode Electropolymerized with Different Sweep Rate

“…10 Great efforts had been made to investigate the polymer electropolymerization. The electropolymerization mechanism has been discussed by Goldsby et al,11 in which they suggested that the anodic polymerization of nickel(II) Schiff base complexes is basically a ligand-oxidized model. Dahm et al 12 researched that Nickel-salen type polymeric films deposited on different support materials (glassy carbon, platinum electrodes and optically transparent tin oxide), and draw a conclusion that the polymer-modified electrode in anodic region corresponds to the Ni(II)/Ni(III) oxidation process.…”

Metallocene-containing conjugated polymers

“…Despite intensive studies of several teams over the last two decades, the mechanism of polymerization, the polymer structure, the type of conductivity and their mechanism of the redox activity still remain a matter of controversy. It was suggested that the polymer chain passes through the set of conjugated bonds inside the salen ligand and the metal, the neighboring monomer units of the polymer being linked via para-or ortho-positions of their side phenyl moieties ("ligand-based polymerization process", so that the electron transport is realized owing to the polaronic-type conductivity along the chain [178][179][180][181][182][183]. An alternative polymerization mechanism might be a metal-based polymerization process, in which the metal is first oxidized, after which the oxidized species could form a stacked deposit stabilized by the charge transfer.…”