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Thermodynamic Complexation of Dopamine with Magnesium (II) in Media With Different Dielectric Constants

The solution equilibria of magnesium (II) complex formed with bidentate ligand of dopamine in acidic media (pH=~4-~6) have been studied in cosolvent systems at 15, 25, 35 ± 0.1° C and 1=0.2 mol.dm-3 sodium chloride, using phosphate buffer, with spectrophotometric methods. Evidence for the 2:1 complex was not observed for magnesium. The stability constant of the complex was determined K M g ( H L ) + = ~9 and the resulting free-energy changes obtained. The protonation constant of dopamine was determined under the above conditions. The results are discussed in terms of the effect of solvent on protonation and complexation.