Thermodynamics of complex formation between aspartic acid and 2,3,4-pyridinecarboxylic acids in aqueous solutions

[Display omitted] •Complexes of Asp with pyridine carboxylic acids in water are formed.•Thermodynamic parameters of complex formation have been calculated.•Stoichiometry of Asp:ligands complexes is 1:2 in water.•Strengthening of the stability of Asp complexes in series: NA → INA → PA is observed. The present work reports on molecular interactions of dicarboxylic amino acid, L-aspartic acid (Asp), with nicotinic acid, isonicotinic acid and picolinic acid in aqueous solutions at 298.15 K. Thermodynamic parameters of complex formation between the reagents were estimated using solution calorimetry method. It was found that strengthening of the stability of the Asp complexes follows the order nicotinic acid