Solution Complexation Reaction Studies of a Pyrazoloisoindol Derivative Ligand by Some Metal Ions in Acetonitrile Solution

Abstract

The complexation reaction between some heavy metal ions such as: Ag⁺, Co²⁺, Hg²⁺, Zn²⁺, Ni²⁺, Cu²⁺, Cd²⁺, Mn²⁺, Cr³⁺, Fe³⁺ and Pb²⁺ with 2,3-dimethyl-1,2-dihydro-8H-pyrazolo[5,1-a]isoindol-8-one, ligand in acetonitrile as nonaqueous solvents at 25 ºC were investigated by spectrophotometric and conductometric methods. The formation constants (k_f) of the 1:1 (metal ion to ligand) complexes were calculated by computer fitting of the absorbance-mole ratio data, and molar conductance-mole ratio data at 25 ºC using the KINFIT program, and found that complexes to vary in acetonitrile solvent in the order of Zn²⁺> Ag⁺> Cr³⁺> Ni²⁺> Hg²⁺> Fe³⁺> Cu²⁺> Cd²⁺> Co²⁺> Mn²⁺> Pb²⁺.

DOI: http://dx.doi.org/10.17807/orbital.v10i6.1141