Mechanism of the electroreduction of Ni (II) ions on mercury electrodes catalyzed by pyridine and its derivatives: nicotinamide, N,N-diethylnicotinamide and nicotine: concept of parallel heterogeneous catalytic reactions

The theory of the polarographic catalytic currents (mechanism CE) has been developed for the system: Ni2+-L-Xp− where L: pyridine (Py), nicotinamide (NA), N,N-diethylnicotinamide (DEN), nicotine (NC) and Xp−: NO− 3, AcO−, HPO2− 4 . The theory is based on the kinetic parallel heterogeneous catalytic reactions: $$\hbox{Ni}^{{2 +}} + \hbox{L}_{{\rm ads}}{\mathop{\rightarrow}^{{k^{'}_{\rm h}}}}\hbox{Ni}({\rm L}_{{\rm ads}}) ^{{2 +}}$$ (1a) $$ \hbox{Ni}X^{{2-{\rm p}}} + \hbox{L}_{{\rm ads}}{\mathop{\rightarrow}^{{k^{''}_{\rm h}}}} \hbox{Ni}\hbox{(X)}(\hbox{L}_{{\rm ads}})^{{2-{\rm p}}}$$ (1b) with the use of Langmuir’s adsorbed isotherm. The kinetic equations obtained for average and instantaneous currents allowed to determine the Langmuir’s parameters (NA

Keywords:

• Stability constants of complexes
• Inorganic chemistry
• Analytical chemistry
• Catalysis
• Spite
• Pyridine
• Ion
• Chemistry
• Kinetic energy
• Electrode
• Polarography
• Electrochemistry

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