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Journal of Solution Chemistry

, Volume 40, Issue 6, pp 1041–1054 | Cite as

Stabilities and Coordination Modes of α-Alaninephosphonic Acid in Copper(II) Heteroligand Complexes with Ethylenediamine, Diethylenetriamine or N,N,N′,N′,N″-Pentamethyldiethylene Triamine in Aqueous Solution

  • A. Kamecka
  • B. Kurzak
  • J. Jezierska
  • A. Woźna
Open Access
Article

Abstract

Solution equilibrium studies on Cu2+–L1–L2 ternary systems have been performed by pH-potentiometry, UV–Vis spectrophotometry and EPR methods (L1 corresponds to polyamines such as ethylenediamine (en), diethylenetriamine (dien), or N,N,N′,N′,N″-pentamethyldiethylenetriamine (Me5dien) and L2 represents 1-aminoethylphosphonic acid (α-alaninephosphonic acid)). The obtained results suggest the formation of heteroligand complexes with [Cu(L1)(α-Ala(P))] stoichiometry in all studied systems. Additionally, in the system with en the [Cu(en)(α-Ala(P))H−1] species is formed in basic solution. Our spectroscopic results indicate tetragonal geometry for the [Cu(en)(α-Ala(P))] species, geometry slightly deviated from square pyramidal for the [Cu(dien)(α-Ala(P))] complex and strongly deviated from square pyramidal towards trigonal bipyramidal for the [Cu(Me5dien)(α-Ala(P))] species. The coordination modes in these heteroligand complexes are discussed.

Keywords

Copper(II) complexes Heteroligand complexes Aminophosphonic acids EPR Vis spectroscopy Potentiometry Equilibria Stability constants Polyamines Five-coordinate complexes 

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Copyright information

© The Author(s) 2011

Authors and Affiliations

  • A. Kamecka
    • 1
  • B. Kurzak
    • 2
  • J. Jezierska
    • 3
  • A. Woźna
    • 1
  1. 1.Institute of ChemistryUniversity of Natural Sciences and HumanitiesSiedlcePoland
  2. 2.Faculty of ChemistryUniversity of OpoleOpolePoland
  3. 3.Faculty of ChemistryUniversity of WrocławWrocławPoland

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