Quinoline-2-thiol Derivatives as Organic Reagents. I. Spectrophotometric Investigations on the Coloration with Some Metal Ions

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Twenty-nine derivative of quinoline-2-thiol were synthesized from thiourea and 2-bromo (or 2-chloro) quinoline derivatives. The limit of identification for metal ions with these reagents was examined by a spot test. These reagents gave a precipitate with the following metal ions : Cu^+, Cu^<2+>, Pd^<2+>, Ag^+, Pt^<4+>, Au^<3+>, Hg^<2+>_2,Hg^<2+>, and Bi^<3+>. The effect of substituted groups on molecular extinction coefficient and wavelength of maximum absorption of reagents, of palladium (II) complexes, and of copper (I) complexes was studied. In these reagents, 4-phenyl-7-methoxyquinoline-2-thiol and 4-methyl-8-ethoxy-quinoline-2-thiol were the most sensitive reagents for palladium (II) and copper (I) in an acetic acid solution. Extraction of palladium (II) complexes with an immiscible organic solvent was also examined.
社団法人日本薬学会の論文
1977-07-25