Potentiometric and spectroscopic studies on copper(II) complexes of non-proteinogenic histidine analogues

K. Várnagy, E. Garribba, D. Sanna, I. Sóvágó, G. Micera

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Copper(II) complexes of the histidine analogues: β-(2-pyridyl)-dl-alanine, β-(2-thienyl)-dl-alanine, β-(1,2,4-triazol-1-yl)-dl-alanine, β-(2-thiazolyl)-dl-alanine ligands, and for comparison α-(2-thienyl)glycine and 2-(2-aminoethyl)pyridine, were studied by potentiometric, UV-VIS, EPR and thermogravimetric techniques. The amino acid residues of the ligands were described as the main binding sites forming mono- and bis-(ligand) complexes, but the interaction between aromatic triazolyl and pyridyl nitrogen atoms and the copper(II) ion also was detected in the case of β-(1,2,4-triazol-1-yl)-dl-alanine and β-(2-pyridyl)-dl-alanine. The presence of heteroaromatic rings in the amino acid analogues influences the amino acid like coordination mode in the order imidazole > pyridyl ∼ triazolyl > thiazolyl ∼ thienyl rings.

Original languageEnglish
Pages (from-to)799-806
Number of pages8
JournalPolyhedron
Volume24
Issue number7
DOIs
Publication statusPublished - May 12 2005

Keywords

  • Copper(II) complexes
  • EPR spectroscopy
  • Histidine analogue
  • pH-Potentiometry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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