6533b850fe1ef96bd12a81ce

RESEARCH PRODUCT

Novel Ni(II) Mixed Ligand Complex Modified Electrode: Catalytic Effect on Anodic Oxidation of Phenol

Ramesh C. SrivastavaRajiv PrakashRajiv PrakashSeema JoshiJegan Mohan

subject

ThiocyanateInorganic chemistrychemistry.chemical_elementElectrochemistryAnalytical Chemistrychemistry.chemical_compoundNickelchemistryOxidation stateCyclamElectrochemistryCyclotetradecaneCyclic voltammetryChemically modified electrode

description

Cyclic voltammetry, using graphite paste electrode (GPE) and chemically modified GPE with Ni(II) mixed ligand complex (MGPE), is described for sensing and detoxification of phenol. A novel mixed ligand complex of nickel with 1,4,8,11-tetraaza cyclotetradecane (cyclam) and thiocyanate in the molar ratio of 1 : 2 : 5 is synthesized and characterized by spectroscopic and electrochemical studies. The Ni(II)-cyclam-thiocyanate complex behaves as a fast electron-transfer mediator, as nickel ions exist in higher oxidation state of Ni(III) on applying a potential of 1.25 V (vs. Ag/AgCl), which catalyses the oxidation of the target species. The mixed ligand complex, when incorporated in the graphite paste electrode, is sensitive to detect phenol as low as 10 μg/L in solution. The catalytic effect of the Ni(II)-cyclam-thiocyanate complex enhanced many folds the oxidation of phenol compared to GPE. The technique has potential for sensing/monitoring and detoxification of phenol released in the ecosystem from polluting industries.

yearjournalcountryeditionlanguage
2004-04-01Electroanalysis
https://doi.org/10.1002/elan.200302841