Conductance Studies on Ion Association of Bis 1-Amidino-o-Alkylurea Copper (II) Thiocynides in Aqueous Solutions at Different Temperatures

摘要

Conductivity measurements of bis 1-amidino-o-methylurea coper (II) thiocyanide, bis 1-amidino-o-ethylurea copper (II) thiocyanide, and bis 1-amidino-o-isobutylurea copper (II) thiocyanide, have been made in aqueous solutions of varying concentrations at 5 to 40 ℃. The limiting equivalent conductances (triangle open_0) and the association constants (K_A) of the complex have been calculated using the method of Shedlovsky technique. The thermodynamics of ions association viz, changes in free energy (triangle openG~0as), enthalpy (triangle openH~0as) and entropy (triangle openS~0as) have been calculated from the values of association constant at different temperatures.