Stability constants of some bivalent metal chelates of 3-aryl-2,4-pentanedione in 75% v/v 1,4-dioxane-water medium.
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概要
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A new ligand, 3-(1-naphthyl)-2,4-pentanedione, was prepared. Concentration proton-dissociation constants of 3-aryl-2,4-pentanedione (aryl group; phenyl, 2,4-dinitrophenyl, and 1-naphthyl) and concentration stability constants of some bivalent metal chelates of 3-aryl-2,4-pentanedione were determined in a 75% v/v 1,4-dioxane–water medium containing 0.05 mol dm<SUP>−3</SUP> sodium perchlorate by a pH-titrimetric method. The dissociation constant (p<I>K</I><SUB>a</SUB>) of 3-(2,4-dinitrophenyl)-2,4-pentanedione, 2,4-pentanedione, 3-phenyl-2,4-pentanedione, and 3-(1-naphthyl)-2,4-pentanedione were found to be 8.87, 10.93, 11.50, and 11.71, respectively. The order of acidity in 2,4-pentanedione was explained by the field effect of the aryl group. The stability constants of the bivalent metal chelates of these ligands were in accord with the Irving-Williams series. The stepwise stability constant of the chelate increased with an increasing p<I>K</I><SUB>a</SUB> value of 3-aryl-2,4-pentanedione. This result cannot be explained by the steric and solvation effect of an aryl substituent.
- 公益社団法人 日本化学会の論文
著者
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Ohashi Kousaburo
Department Of Achemistry Faculty Of Science Ibaraki University
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NAKANO Yoshiharu
Department of Chemistry, Faculty of Science, Ibaraki University
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Yamamoto Katsumi
Department Of Anesthesiology University Of Occupational And Environmental Health School Of Medicine
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Wakui Yoshito
Department of Chemistry, Faculty of Science, Ibaraki University
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Yano Katsunori
Department of Chemistry, Faculty of Science, Ibaraki University
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