Mixed ligand complexes of copper(II)-1-(2-pyridylazo)-2-naphthol with bidentate ligands.
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概要
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Formation constants of mixed ligand complexes of copper(II)-1-(2-pyridylazo)-2-naphthol chelate (Cu(pan)) with bidentate ligands, which accelerate the rate of color change of 1-(2-pyridylazo)-2-naphthol (PAN) indicator in copper(II)-EDTA titrations, were determined by the spectrophotometric method in 5 or 10% v/v dioxane–H<SUB>2</SUB>O at μ=0.1 (KNO<SUB>3</SUB>) and at 25 °C. The overall formation constants (log<I>K</I><SUB>Cu(pan)L</SUB><SUP>pan.L</SUP>=log ([Cu(pan)L]/[Cu][L][pan]) are 21.26 (5% dioxane) for 2,2′-bipyridine, 21.64 (10% dioxane) for ethylenediamine, 22.80 (5% dioxane) for 8-hydroxy-5-quinolinesulfonic acid, 19.39 (10% dioxane) for glycine, and 20.68 (10% dioxane) for iminodiacetic acid. These ligands coordinate with Cu(pan) chelate as bidentate ligands, and the mixed ligand complexes may have a distorted octahedron structure. Thus the Cu–pan bond in the mixed ligand complex is weakened.
- 公益社団法人 日本化学会の論文
著者
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Wada Hiroko
Laboratory Of Analytical Chemistry Nagoya Institute Of Technology
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Nakagawa Genkichi
Laboratory Of Analytical Chemistry Nagoya Institute Of Technology
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Ikuta Kazuyoshi
Laboratory of Analytical Chemistry, Nagoya Institute of Technology
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