O.B. Tomilin - Ph. D. (Chem.), Head of Department Physical Chemistry, Ogarev Mordovian State University (Saransk). E-mail: tomilinob@mail.ru E.E. Muryumin - Ph. D. (Chem.), Associate Professor, Department Physical Chemistry, Ogarev Mordovian State University (Saransk). E-mail: mur_ee@mail.ru E.V. Rodionova - Research Scientist, Department Physical Chemistry, Ogarev Mordovian State University (Saransk). E-mail: rodionova_i87@mail.ru