STUDY OF THE ABSORPTION-SPECTRA AND IONIC EQUILIBRIA OF CATIONIC ANIONIC POLYMETHINE DYES

被引：11

作者：

TATIKOLOV, AS

DZHULIBEKOV, KS

KRASNAYA, ZA

GRECHKINA, EV

AVDEEVA, VI

KUZMIN, VA

机构：

来源：

BULLETIN OF THE RUSSIAN ACADEMY OF SCIENCES-DIVISION OF CHEMICAL SCIENCE | 1992年 / 41卷 / 11期

关键词：

POLYMETHINE DYES; ABSORPTION SPECTRA; IONIC EQUILIBRIA;

D O I：

10.1007/BF00863360

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The absorption spectra of a number of cationic-anionic polymethine dyes in polar, low-polarity, and nonpolar solvents were studied. It was established that in polar solvents the absorption spectra represent the sum of the absorption spectra of the cation and anion, whereas in nonpolar and low-polarity solvents, in many cases the appearance of a short-wave absorption band is observed, due to interaction of the chromophores of the cation and anion in ion pairs. In solvents of intermediate polarity (for example, in chloroform and ethyl acetate), a concentration dependence of the absorption spectra is observed, determined by the equilibria of ionic dissociation. The ionic dissociation constants of a number of cationic-anionic dyes in chloroform and ethyl acetate were determined by a conductometric method. The thermodynamic data obtained are compared with the spectral data.

引用

页码：1985 / 1991

页数：7