Studies in Colloidal Behaviour and Absorption Spectra of Azoxine S Dyes
Open Access
- 1 December 1967
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 22 (12) , 1303-1305
- https://doi.org/10.1515/znb-1967-1214
Abstract
The colloidal nature of 7-Phenylazo-8-hydroxyquinoline-5-sulphonic acid (A) and 7- (4-Sulphophenylazo) -8-hydroxyquinoline-5-sulphonic acid (B) in aqueous solution has been established by electrical conductance measurements. The curves obtained by plotting the square-root of concentration and molar conductance of the dyes are not linear. The temperature coefficient per degree centigrade per hundred units of conductance at 35° is below 2.0 in each case. The temperatures of zero conductance, determined by extrapolation are -20 and -25° in the dyes (A) and (B) respectively. The absorption spectra of eleven azoxine S dyes in acidic, alkaline and at pH ~4 have been studied and their molar absorptivities at absorption maxima determined.Keywords
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