Solution Equilibria Formation of Manganese(II) Complexes with Ethylenediamine, 1,3-Propanediamine and 1,4-ButanediaMine in Methanol

Manganese is an abundant element that plays critical roles and at the reaction center of several enzymes. In order to promote understanding behavior manganese(II) ion with aliphatic ligands, in this work, stability spectral complexes ethylenediamine, 1,3-propanediamine or 1,4-butanediamine were explored. A spectrophotometric study its speciation methanol was performed 293 K. The formation constants obtained for these systems were: manganese(II)-ethylenediamine log β110 = 3.98 β120 7.51; manganese(II)-1,3-propanediamine 5.08 8.66; manganese(II)-1,4-butanediamine 4.36 8.46. These results by fitting experimental data using HypSpec software. reported show a pattern could be related chelate effect which molar absorbance not directly increase carbon chain ligands.