Electrochemical Behavior of Ni(II)-Salen at the Mercury Electrode

Table 1

Comparison of Ni(II)-, Cu(II)-, and UO₂(II)-salen complexes in an aqueous medium.

Metal-salen complex	Electrode	Supporting electrolyte (at pH 7.0)	Detection limit (mol L^−1)	Cathodic peak potential, 𝐸𝑝𝑐, (mV)
Nickel	Hanging mercury drop	Hepes and phosphate	3.4 × 10^−9	−1400 and −2000
Copper [38, 39]	Hanging mercury drop	Phosphate	1.0 × 10^−8	−160, −530, −990 and −1100
Uranyl [38, 40]	Hanging mercury drop	Hepes	1.0 × 10^−8	−590, −950 and −1140