[en] Methods of paramagnetic double refraction and proton magnetic relaxation were used to study Dy³⁺ complexing with zwitter-ion of L-α-alanine (HA^+-) in water-acetonitrile (AN) and water-dimethylformamide (DMFA) solvents of variable composition. Acidic-basic properties of HA^+- and its solvate state in the given solvents were investigated by the methods of pH-metry and polarometry respectively. The obtained results were used to conclude, that organic component effect on acidic-basic and complexing properties of HA^+- in studied systems is connected with organic component effect on ligand conformation in result of change of its state