Acid-Base Property and Metal Chelate Formation of 4-(2-Pyridylazo)-resorcinol

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概要

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• Acid dissociation stages of analytical reagent 4-(2-pyridylazo)-resorcinol (PAR) and metal chelate formation of PAR were investigated by absorption measurements and pH-titrations. The first acid dissociation constant was determined as 1.48×10<SUP>－6</SUP> (p<I>k</I><SUB>a1</SUB>=5.83) and the second as 3.2×10<SUP>－13</SUP> (p<I>k</I><SUB>a2</SUB>=12.5) at 25°C. PAR forms 1 : 2 chelate with Fe(III), Co(II) and Ni(II), and forms 1:1 chelate with Cu(II), Zn(II), Cd(II), Hg(II) and Pb(II). The stability constant of copper(II)-PAR chelate was determined as 5×10<SUP>11</SUP> at 25°C. Some analytical aspects of PAR were also discussed.

• 社団法人 日本化学会の論文

著者

• IWAMOTO T.

  Department of Electronics, Faculty of Engineering, Tohoku University

• Iwamoto Toschitake

  Department of Chemistry Faculty of Science The University of Tokyo

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• Acid-Base Property and Metal Chelate Formation of 4-(2-Pyridylazo)-resorcinol

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