Complexes of aminophosphonates part 9.1 Copper(II) complexes of citric acid derivatives

Erzs Ébet Kiss, Malgorzata Jezowska-Bojczuk, Tamas Kiss

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17 Citations (Scopus)


Complex formation between copper(II) and 3-amino-3-phosphonoglutaric acid (Apga), an ambidentate aminophosphonate or citric acid derivative, was studied in aqueous solution by pH-potentiometry and EPR and electronic spectroscopy. Complexation with the parent molecules citric acid and tricarballylic acid was reinvestigated. The stoichiometries and stability constants of the complexes formed in these systems were determined at 25°C at an ionic strength of 0.20 mol dm-3 (KCl). Stability constant data and spectroscopic results revealed that in the acidic pH range Apga behaves as a citric acid derivative, forming the phosphonate-bridged dimeric species Cu2A2H2, while in the basic pH range, with decreasing proton competition at the amino binding site, it rearranges to yield mononuclear complexes involving aminophosphonate-likē (NH2, PO32-, CO2) coordination.

Original languageEnglish
Pages (from-to)157-166
Number of pages10
JournalJournal of Coordination Chemistry
Issue number1-2
Publication statusPublished - Jan 1 1996


  • Aminophosphonic acids
  • Citric acid
  • Complexes
  • Copper(II)
  • Potentiometry
  • Spectroscopy
  • Stability constants
  • Tricarballylic acid

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry

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