Stability constants of vanadium(V), nickel(II) and iron(II) chelates with pyridylazophenol derivatives.

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  • ピリジルアゾフェノール系試薬のバナジウム（Ｖ），ニッケル（ＩＩ）及び鉄（ＩＩ）キレートの安定度定数
  • ピリジルアゾフェノールケイ シヤク ノ バナジウム 5 ニッケル 2 オヨビ

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Abstract

Acid dissociation constants of 2-(2-pyridylazo)phenol (PAP) and 2-(2-pyridylazo)-5-methylphenol (PAP-5Me) and the stability constants of their chelates with vanadium(V), nickel(II), and iron(II) were determined by spectrophotometry at 293 K and μ=0.1. The acid dissociation constants were; pKa1(PAP)=2.53, pKa2=8.76, pKa1(PAP-5Me)=2.67 and pKa2(PAP-5Me)=8.95.Since iron(II)-PAP chelate was insoluble in water, its stability constant in water was determined by an extrapolation of stability constants in aqueous dioxane. Other stability constants were determined directly in water. They were;logβ1{V(V)-PAP}=12.43, logβ1{Ni(II)-PAP}=9.79, logβ2{Ni(II)-PAP} =21.78, logβ1{Fe(II)-PAP}=11.95, logβ2{Fe(II)-PAP}=24.45, logβ1{V(V)-PAP-5Me}=12.87, logβ1{Ni(II)-PAP-5Me}=10.67, logβ2{Ni(II)-PAP-5Me}=22.17, logβ2{Fe(II)-PAP-5Me} =25.51.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 40 (2), 101-104, 1991

    The Japan Society for Analytical Chemistry

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