On The Effect of Dielectric Constant on Formation and Stability Constants of Vanadium(v) with Leucine in Mixed Solvent of Methanol + Water at 298.15 K

Abstract

Equilibria in aqueous solutions in the system leucine + VO₂ ⁺ has been studied by a combination of potentiometric and spectrophotometric methods, in the p^H range 3–4.4 with high ligand-to-metal ratios. An equilibrium model, MY, is assumed, where M and Y represent the metal ion and fully dissociated amino acid anion, respectively. The results showed that formation and stability constants of complex system increased with decrease of dielectric constants. Linear relationships were observed when log K_P was plotted vs. 1/D, where K_P and D represent stability and dielectric constants of the system, respectively.

Key Words:

• Stability constant
• dielectric constant
• leucine
• methanol