tailieunhanh - Ebook Modern physical organic chemistry: Part 2

(BQ) Part 2 book "Modern physical organic chemistry" has contents: Inverse phase transfer catalysis in organic synthesis, solubilization of carbon nanotubes in water, thin CVD diamond films – synthesis, properties, applications, functional polymers forming complexes with metal ions,.and other contents. | „New trends in supramolecular chemistry” Edited by Volodymyr I. Rybachenko Donetsk 2014, East Publisher House, ISBN 978-966-317-208-8 Chapter 8 Acid-base equilibria in ‘oil-in-water’ microemulsions. The particular case of fluorescein dyes Nikolay O. Mchedlov-Petrossyan, Natalya V. Salamanova, and Natalya A. Vodolazkaya . Karazin Kharkov National University, Svoboda Sq. 4, 61022 Kharkov, Ukraine 1. Introduction An increasing use of organized solutions in different branches of chemistry [1–13] calls for extending the concepts of ionic equilibria in these media. Lyophilic systems, that is, thermodynamically stable dispersions with wellreproducible properties, are probably most suitable for analytical chemistry and molecular spectroscopy. In addition to typical lyophilic dispersions, such as micellar solutions of colloidal surfactants in water, these systems include microemulsions usually formed by a colloidal surfactant, a hydrocarbon, and an alcohol, which possess limited solubility in water [1, 3, 5, 8, 14]. Protolytic equilibria in microemulsions have been studied less comprehensively than those in micellar solutions of surfactants. The corresponding publications are few in number [13, 15–22], as compared with the vast literature devoted to acid-base reactions in micellar solutions of surfactants. (See, for instance, some reviews [13, 23–25]). In order to fill up this gap, we decided to gain insight into the properties of microemulsions as media for such processes. Our previous studies were devoted to determination of the parameters of ionic equilibria of a set of acid-base indicators in microemulsions stabilized by cationic, anionic, and non-ionic surfactants. In these colloidal systems, sulfonephthaleins, azo-dyes and some other common acid-base indicators, as well as solvatochromic Reichardt’s betaine dyes have been studied [20–22]. This work was aimed to systematic study of protolytic behavior of three widely used hydroxyxanthene luminophores, namely .