Analysis of complexation between new bidentate bis-NHC ligand and some metal cations at different temperature

In this research, the determination and complexation process between ۳,۳'-(۲,۲'-(۴-methyl-phenylenesulfonamido)bis(ethane-۲,۱-diyl))bis(۱-benzyl-۳H-benzo[d]imidazol-۱-ium)dibromide with Ni۲+, Zn۲+, Pd۲+, Ag+, and Hg۲+ cations in the binary mixture of methanol (MeOH) and water (H۲O) at different temperatures (۱۵, ۲۵, ۳۵ and ۴۵ºC) were studied using a conductometric method. The results show that the stoichiometry of the complexes in all binary mixed solvents for Ni۲+, Zn۲+, and Pd۲+ were ۱:۱ (M:L), while in other cases ۱:۲ (M:L) and ۲:۱(M:L). The stability constants (log ) of complex formation have been determined by fitting molar conductivity curves using a computer program (GENPLOT). The obtained data shows that in the pure methanol solvent system, the stability order is Ni۲+< Pd۲+thermodynamic parameters were determined conductometrically. The complexes in all cases were found to be enthalpy destabilized but entropy stabilized. The experimental data was tested by using an artificial neural network (ANN) program and was in good agreement with the estimated data.

کلیدواژه ها:

Analysis ، Complexation process ، Ligand ، Conductometric method ، Binary mixed solvent ، thermodynamic parameters