A novel dinuclear Schiff-base copper(II) complex modified electrode for ascorbic acid catalytic oxidation and...

Area of Science:

• Coordination Chemistry
• Electrochemistry
• Materials Science

Background:

• Schiff-base complexes are versatile ligands in coordination chemistry.
• Copper complexes exhibit diverse electrochemical and catalytic properties.
• Electropolymerization offers a route to create modified electrode surfaces.

Purpose of the Study:

• To synthesize and characterize a novel dinuclear copper salicylaldehyde-glycine Schiff-base complex.
• To investigate the electropolymerization behavior of the copper complex on a glass carbon electrode.
• To evaluate the electrocatalytic performance of the modified electrode for ascorbic acid determination.

Main Methods:

• Synthesis and single-crystal X-ray diffraction of the dinuclear copper complex.
• Electropolymerization studies on a glass carbon electrode at varying potential ranges.
• Amperometric determination of ascorbic acid using the modified electrode.

Main Results:

• The dinuclear copper complex [Cu(2)(Sal-Gly)(2)(H(2)O)(2)] was successfully synthesized and structurally characterized, crystallizing in the monoclinic P2(1)/c space group.
• Electropolymerization of the complex occurred at a high scan potential of 1.4 V, forming a stable modified electrode.
• The modified electrode demonstrated significant electrocatalytic oxidation of ascorbic acid with high sensitivity (22.9 nA μM⁻¹) and a low detection limit (0.39 μM).

Conclusions:

• A novel dinuclear copper Schiff-base complex was synthesized and characterized.
• The complex can be electropolymerized to form a modified electrode with excellent electrocatalytic properties.
• The developed method is suitable for the sensitive and accurate determination of ascorbic acid in vitamin C tablets.