薬品のポーラログラフ的研究 第6報

Camphor誘導体のポーラログラフィー (ii) 8-Oxocamphor

抄録

8-Oxocamphor is reduced to 8-hydroxycamphor at the dropping mercury electrode and its half-wave potential is indicated by E_1/2=-1.15-0.06 pH (pH >9.5), E_1/2=-1.73 (pH 6.8-9.5), E_1/2=-1.07-0.09 pH (pH 1-4), its diffusion current constant being 2.67 and temperature coefficient 1.6%. 8-Oxocamphor shows the maximum wave in a solution containing CoCl₂ or [Co(NH₃)₆]Cl, NH₄Cl, and gelatin, and the height of its peak is related to the surface area of electrode alone, irrespective of the direction of applied voltage, velocity, and mercury head of the electrode, the peak voltage being indicated by E_m=-1.76-iR. Inverse number of the height of the peak and inverse number of the concentration of 8-oxocamphor and cobaltic chloride are in linear relationship, there being an inflexion at the point of [8-oxocamphor]:[CoCl₂]=1:2. It is also related to the concentration of the ammonium salt and gelatin, and becomes lower with the rise of temperature.