Abstract
Four related Wurster salts are subjected
to a polarographic investigation. In the case of Wurster's blue, results from
the dropping mercury electrode, stationary platinum electrode, and rotated
platinum electrode are compared.
The Wurster salt of p-phenylenediamine is
unstable in aqueous solution but is fairly stable in a mixture of methanol,
acetic acid, and water and the decrease of diffusion current with time
indicates a disproportionation.
Wurster's red is also unstable in aqueous
solution. In the solvent methanol, acetic acid, and water, a wave is observed
with the stationary platinum electrode whose E� compares favourably
with the potentiometric E?0.
Evidence from the three types of
electrodes mentioned previously indicates two one-electron waves for Wurster's
blue. The semiquinone formation constant qualitatively appears much greater
than that reported from potentiometric work. Decrease of diffusion current with
time is perhaps due to a disproportionation (the very unstable di-imine has
been shown to revert to the radical in aqueous solution).
Polarographic waves given by the Wurster
salt of diaminodurene suggest that the radical does not exist in aqueous
solution. Waves corresponding to the original amine and duroquinone (formed by
hydrolysis of the di-imine) are obtained.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献