Optical probes of the influence of surfactant micelles on tautomeric equilibria

Abstract

Optical probes are sensitive molecules whose spectral characteristics vary depending on the microenvironment. They are widely used to study micellar systems of surfactants and their effect on the tautomeric equilibria of organic compounds.
Tautomerism is a dynamic equilibrium between isomers of an organic compound that differ in the position of a mobile hydrogen atom (for example, keto-enol tautomerism). In the presence of surfactant micelles, the equilibrium may shift due to:
1) Local polarity changes
2) Electrostatic interactions
3) Hydrogen bonds
Optical probes allow you to track shifts in tautomeric equilibrium in real time. For example, azo compounds (magnezone HC, lumogallion IREA, methyl orange) - their tautomerism (azo-hydrazone) is sensitive to pH and micelle charge.
In cationic micelles (for example, CPC and CTAB), tautomers with a negative charge can be attracted to a positively charged surface, which stabilizes one of the forms.
Optical probes help to understand how surfactant micelles affect tautormeric equilibria, which is important for developing new sensors, controlling chemical reactions in micellar systems, and studying intermolecular interactions in solutions.

Speaker

Tyunina Yu.A
Saratov State University
Russia

Discussion

Ask question