Related Experiment Video
Updated: Jun 28, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
Published on: October 18, 2018
Studies on some cadmium mixed ligand complexes using differential pulse polarography
1Department of Chemistry, Faculty of Science, University of Ain Shams, Cairo, Egypt.
Abstract:
Differential pulse polarography was used to study the mixed ligand complexes of imidazole and some dicarboxylate anions namely, oxalate, tartrate and malonate with Cd(II) at constant ionic strength (mu = 1, NaNO(3)) at 25 +/- 0.1 degrees . It has been found that the reduction of complexes is reversible and diffusion-controlled. Three mixed complexes are formed with malonate (or oxalate) whereas four mixed complexes are formed with tartrate. The overall stability constants for each system were calculated and discussed.
Related Concept Videos
Voltammetric Techniques: Linear-Scan (E vs Time)
Complexometric Titration: Ligands
EDTA: Chemistry and Properties
Voltammetric Techniques: Pulse Voltammetry
Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Ladder Diagrams: Complexation Equilibria
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...

