Redox and electrocatalytic properties of electrodes modified by films of polypyrrole nickel(II) Schiff-base complexes

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

“…The acceptor effect of p-bromine substituent in Mn(III)ClL1 shifts the halfwave potential from )0.300 V (in Mn(III)ClL1 5,5¢-not substituted) to +0.020 V (Mn(III)ClL2, 5,5¢-brominated) as previously described [27]. The reduction waves of nickel(II) complexes are located at )1.660 V (ligand H 2 L1) and )1.400 V (ligand H 2 L2) [46,47]. When the speed rate changes, this single reduction wave is sometimes decomposed into two steps and the second peak is often more clear than the first.…”

Electron-rich salen-type Schiff base complexes of Cu(II) as catalysts for oxidation of cyclooctene and styrene with tert-butylhydroperoxide: A comparison with electron-deficient ones

“…4, II). Peak II is observed at nearly the same potential value as the corresponding ligand and may be due to irreversible oxidation of the ligand [25,26]. Peak I, which is absent in the CV of the free ligand, can be attributed to the irreversible oxidation of Cu(II) to Cu(III) [27].…”

Poly(N-methylaniline)/nickel modified carbon paste electrode as an efficient and cheep electrode for electrocatalytic oxidation of formaldehyde in alkaline medium

“…But the great importance of nickel electrochemistry in alkaline medium has attracted the attention of many researchers either to study the behavior of nickel-based electrode itself or its electrochemical activity toward many other molecules. In addition to the pure nickel electrode, other different nickel-based electrode such as nickel hydroxide modified glassy carbon electrode (GCE), nickel complexes/glassy carbon electrode or nickel-based alloys have been tested for amperometric detection of carbohydrates, amines and amino acids [14][15][16][17][18][19][20], electrocatalytic oxidation of alcohols [21][22][23][24][25][26] and hydrogen peroxide [27] related to fuel cell technology development. Electrochemical studies using nickel-based modified electrodes have established that various electroreactant species can be determined with a high rate of heterogeneous electron transfer, good sensitivity and reproducibility [28].…”