Astanov SK, Kasimova GK, Kurtaliev EN, Nizomov NN, Jumabaev A. Electronic nature and structure of aggregates of riboflavin molecules.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021;
248:119177. [PMID:
33257239 DOI:
10.1016/j.saa.2020.119177]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/25/2020] [Accepted: 10/31/2020] [Indexed: 06/12/2023]
Abstract
Aggregation process of riboflavin molecules in binary mixtures: water - dioxane, water - DMSO, and ethanol - isobutanol, were investigated using spectroscopic methods and quantum-chemical calculation. It was shown that at a constant concentration of riboflavin and different ratios of binary mixtures, a deformation of the electronic absorption spectra with a hypochromic effect is observed. The observed changes are caused by the formation of a hydrogen bond and dipole-dipole interaction between riboflavin molecules, which is accompanied by a shift and resonance splitting of excited electronic levels.
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