Accession Number : AD0286870

Title :   IONIC ASSOCIATION IN AQUEOUS SOLUTIONS OF THIONINE

Corporate Author : CALIFORNIA UNIV LOS ANGELES

Personal Author(s) : HAUGEN,G.R. ; HARDWICK,E.R.

Report Date : 30 APR 1962

Pagination or Media Count : 1

Abstract : Beer Law deviations occur in even the most dilute solutions of thionine, in either chloride or sulfate systems. These effects are evidently caused by association of the dye cations, since ion-pairing cannot account for them. The low concentration spectrophotometric data fi a theoretical dimerization model, but the agreement disappears at moderate and high dye concentrations. Quantitative measurements of the dependence of the apparent extinction coefficient on added chloride ion in dye chloride systems leads to he conclusion that dimers and possibly trimers contain respectively one and two chloride ions. The data strongly indicate much higher polymerization at large concentrations, with gegenions playing a significant role; however, the dye salts out rapidly as counter ion concentration in the solution is increased. (Author)

Descriptors :   *THIAMINES, ABSORPTION, CHLORIDES, FLUORESCENCE, IONS, POLYMERIZATION, POLYMERS, REACTION KINETICS, SOLUBILITY, SOLUTIONS(MIXTURES), SPECTROGRAPHIC ANALYSIS, SULFATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE