The reduction of some aminoacridines has been investigated by controlled potential coulometry. The number of electrons involved in the first reduction stage has been determined by a graphical treatment of the current‐time values obtained using a divided electrolysis cell. With the exception of 5‐aminoacridine the results confirm the values obtained indirectly by Kaye5.
The temperature dependence of the critical micelle concentrations (cmc) of decyl, dodecyl and tetradecyl trimethylammonium and dodecyl benzyl dimethylammonium bromides in the presence of glucose or sucrose is reported. Thermodynamic parameters have been calculated using the uncharged phase‐change model. An interpretation of the changes in cmc values, relative to those in simple aqueous solutions, is offered in terms of the resultant of two effects, namely modifications in water‐structure and reduction of dielectric constant.
THE application of controlled potential coulometry to the electroreduction of the triphenylmethane dyestuffs crystal violet and brilliant green is described below. The polarographic work by Kaye and Stonehill (1952) indicated that, like the aminoacridines previously examined (Wilson, Butler, Ingle and Taylor, 1960), these were reduced in two stages each involving the uptake of one electron. The aim of the present work was to seek confirmation of this by direct measurement of the quantities of electricity involved in the reduction of a known amount of dyestuff.
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