o-(2-チアゾリルアゾ)-フェノール誘導体による銅の定量

概要

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ο-(2-Thiazolylazo) phenol derivatives give reactions with copper ion and change their coloration to red, green or blue. A micro-quantitative determination of copper by use of these reagents was attempted seeking the suitable operating conditions. The results were summarized in Table II. The absorption spectra of the reagents in alkaline dioxane-water were similar to those of their respective copper chelates.<BR>Between these were found definite correlations in molecular extinction coefficient and in maximum absorption wavelength (Fig. 3 and 4). Two forms of copper chelates (Table III) with combining ratio of 1 : 1 and 1 : 2 were observed, the latter being extractable with organic solvents. The formation constants of these copper chelates were estimated by the photometric method, and were found to be highly correlated with the acid dissociation constants obtained for respective phenols (Fig. 8).
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