Extraction equilibria for the 4-(2-Pyridylazo)-Resorcinol-Nickel(II)-Quaternary-Ammonium salt system

Hitoshi Hoshino, Takao Yotsuyanagi, Kazuo Aomura

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34 Citations (Scopus)


The extraction equilibria of nickel(II)-PAR complexes with tetradecyldimethylbenzylammonium chloride(Q+Cl-) are investigated. Two kinds of nickel complex are extracted by chloroform: Ni(HR)2,nQ+Cl- (0)(ε{lunate}500 = 3.73·104l mol-1cm-1) at about pH 5 and 2Q+ NiR2-2 (o)(ε{lunate}500 = 8.08·104 l mol-1 cm-1) at above pH 8.5. The extraction constant for 2Q+ NiR2-2 (o) was evaluated as [2Q+ NiR2-2]0/[NiR2-2] [Q+]2 = 1011.16 at μ = 0.1 (Na2SO4. Synergic extraction studies of the Ni(HR)2 species under slightly acidic conditions show that the species is Ni(HR)2(H2O)2in auqeous solution and is extracted into chloroform as the adduct Ni(HR)2(TBP)2 (ε{lunate}535 = 3.57·104 l mol-1 cm-1. Based on the extraction behavior of these complexes, the structures of the Ni2+-PAR complexes are discussed.

Original languageEnglish
Pages (from-to)317-328
Number of pages12
JournalAnalytica Chimica Acta
Issue numberC
Publication statusPublished - 1976 May

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy


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