The Effect of Acidity of the Medium on the Structure Nile Red

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The change in the structure of Nile red when treated with acids of different strength: acetic, formic and hydrochloric acids was studied by IR spectroscopy. In the IR spectra of the dye dried after treatment with formic and hydrochloric acids, the appearance of absorption spectra corresponding to shaft vibrations of N–H+-bonds of tertiary amines and O–H-bonds of hydroxyl groups was recorded. In the IR spectra of the dye dissolved in acetic and formic acids, the appearance of the absorption spectra of O–H-bonds of hydroxyl groups is predominantly traced. Thus, it was found that the most probably protonation centers in the molecule of Nile red are the amino group and carbonyl group. Analysis of UV-visible spectra of the dye in acetic and formic acid and in DMSO showed that in acetic acid Nile red probably exists mainly in the non-protonated form, and in stronger formic acid a significant part of its molecules is protonated, which is accompanied by a complication of the form of the spectrum.

作者简介

N. Popov

Northern (Arctic) Federal University Lomonosov Moscow State University

Email: s3019159@edu.narfu.ru
Arkhangelsk, Russia

K. Bogolitsyn

Northern (Arctic) Federal University Lomonosov Moscow State University; The Federal Research Center for Integrated Studies N. P. Laverov Ural Branch of the Russian Academy of Sciences

Email: k.bogolitsin@narfu.ru
Arkhangelsk, Russia; Arkhangelsk, Russia

T. Skrebets

Northern (Arctic) Federal University Lomonosov Moscow State University

Arkhangelsk, Russia

Kh. Mamatmurodov

Northern (Arctic) Federal University Lomonosov Moscow State University

Arkhangelsk, Russia

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