o-(2チアゾリルアゾ)フェノール誘導体によるコバルト(III)の定量

概要

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ο-(2-Thiazolylazo) phenol derivatives reacts with cobalt and form green chelates in the presence of potassium periodate. They have limited solubilities in water but can be extracted readily with chloroform. Their chloroform solutions showed maximum absorptions at 600700 mμ(Fig. 1 and 2, and Table II), and their molar extinction coefficients were 1.52.5×104 (Table V). As the maximum absorption of the cobalt (III) chelate is shifted to the longer wavelength from those of the other chelates, there is less disturbance by the presence of other metal ions. The constitutions of chelates (Fig. 8 and 9) and the effects of pH (Fig. 47) have been investigated and the conditions for determination of cobalt have been established.
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