Comparison Studies on Complexation of Molybdenum(VI) with Aspartic Acid And Glutamic Acid in Different Dielectric Constants1

Abstract

Equilibria of the reaction of molybdenum(VI) with L-aspartic acid (Asp) and L- Glutamic acid<br />(Glu) have been studied by spectrophotometric measurements in mixed solvent systems at an ionic<br />strength of 0.2 mol/dm3 sodium perchlorate, employed (15, 20, 25, 30± 0.1°C) at pH ranges of 3.2<br />to 5.5 with a high ratio of ligand to metal. The stability constants of the complexes and the<br />resulting free energy changes are presented. The effect of solvent systems on protonation and<br />complexation are discussed. Linear relationships are observed by plotting logK versus 1/D , where<br />K and D show stability and dielectric constants, respectively.