Solubility and synergistic extraction equilibria for (4-(2-pyridylazo)resorcinolato) nickel(II) complexes.
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概要
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The nickel(II) complex of 4-(2-pyridylazo)resorcinol (PAR, H<SUB>2</SUB>L) is known to show somewhat anomalous and complicated behavior in solution. In this regard, the solubility and the synergistic extraction equilibria of the above complex are studied in connection with acid dissociation reactions. The intrinsic solubility and the acid dissociation constants are determined to be, <I>S</I><SUB>0</SUB>=[[Ni(HL)<SUB>2</SUB>]]=10<SUP>−6.2±0.1</SUP> mol dm<SUP>−3</SUP>, <I>K</I><SUB>a1</SUB>=[[Ni(HL)L]<SUP>−</SUP>][H<SUP>+</SUP>][[Ni(HL)<SUB>2</SUB>]]<SUP>−1</SUP>=10<SUP>−6.2±0.1</SUP>, and <I>K</I><SUB>a2</SUB>=[[NiL<SUB>2</SUB>]<SUP>2−</SUP>][H<SUP>+</SUP>][[Ni(HL)L]<SUP>−</SUP>]<SUP>−1</SUP>=10<SUP>−7.1×0.1</SUP>, respeactively in the solution with the ionic strength of 0.10 (Na<SUB>2</SUB>SO<SUB>4</SUB>) at 298 K. Using the above constants, the extraction constant of the neutral complex with trioctylphosphine oxide (TOPO) into chloroform is evaluated as <I>K</I><SUB>ex</SUB>=[[Ni(HL)<SUB>2</SUB>(TOPO)<SUB>2</SUB>]]<SUB>o</SUB>[[Ni(HL)<SUB>2</SUB>]]<SUP>−1</SUP>[TOPO]<SUB>o</SUB><SUP>−2</SUP>=10<SUP>3.1±0.2</SUP>, where the subscript o denotes the organic phase. An equilibrium diagram for the nickel(II)–PAR complexes is proposed.
- 公益社団法人 日本化学会の論文
著者
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HOSHINO Hitoshi
Department of Applid Chemistry, Graduate School of Engineering, Tohoku University
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YOTSUYANAGI Takao
Department of Applid Chemistry, Graduate School of Engineering, Tohoku University
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Yotsuyanagi Takao
Department of Applied Chemistry, Tohoku University
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