Determination of Stoichiometry and Stability Constant of Cd(II) and Zn(II) Complexes with Pyrazole Based Ligands in Mixed Solvent (EtOH-H2O)

A Spectrophotometric investigation was applied on the complexation of 1,3-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,3-PPB) and 1,4-bis (1,4-PPB) with Zn(II) Cd(II) ions in a mixed (1:1) solvent water ethanol. The mole ratio methodology used to calculate stoichiometry, molar absorptivity, stability constant values. Some experimental conditions have been investigated, including pH, ionic strength, composition, time. results revealed production 1:1 complexes. In terms ligands, 1,4-PPB more stable than 1,3-PPB, whereas complexes were complexes' absorptivity values determined be 5744, 10019, 9414, 17716 l.mol-1.cm-1 for Cd-1,3-PPB, Cd-1,4-PPB, Zn-1,3-PBB, Zn-1,4-PBB, respectively. sensitivities Cd Zn estimation by 1,3-PPB 1,4-PPB, respectively, 0.051, 0.089, 0.114, 0.271 mg.l-1.