TY JOUR TI STUDY OF THE STRUCTURE AND PROTOLYTIC ABILITY OF DICARBOXYLIC ACIDS BY QUANTUM CHEMISTRY AND EPR-SPECTROSCOPY METHODS KW quantum chemical calculations KW hydrogen bond KW intermolecular hydrogen bonds KW complex compounds KW complexation energy KW density functional theory JO Modern Technologies and Scientific and Technological Progress AU Klimenko, E.A. AU Nikolskiy, S.N. AU Beznosyuk, S.A. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»