1974 年 22 巻 6 号 p. 1378-1385
Stability constants and extraction constants of some metal complexes of N-phenyl-β-mercaptocinnamamide (I), N-ethyl-β-mercaptocinnamamide (II) and thiodibenzoylmethane (III) were determined by solvent extraction method in chloroform and isoamyl acetate systems. The stability constants in I-metal and II-metal systems are smaller than those in III-metal system whereas the extraction constants in the former two systems are larger than those in the latter. In these ligands, the difference in the partition coefficients is regarded as a main factor to cause the remarkable difference in the extractability of metal ion. It was shown that the introduction of amide group makes the reagent hydrophilic to react readily with the metal ions in the extraction system.
