Studies on transition-metal-peptide complexes. Part 2. Equilibrium study of the mixed complexes of copper(II) with aliphatic dipeptides and amino-acids

I. Nagypál, Arthur Gergely

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29 Citations (Scopus)

Abstract

In a total of 39 equilibrium systems, the stability constants of mixed dipeptide-amino-acid complexes of copper(II) have been determined at 25 °C and ionic strength I = 0.2 mol dm-3 KCl. The dipeptides used are glycylglycine, glycyl-DL-α-alanine, and DL-α-alanyl-DL-α-alanine, and the amino-acids are glycine, α-alanine, α-aminobutyric acid, norvaline, β-alanine, serine, threonine, ornithine, lysine, asparagine, glutamine, aspartic acid, and glutamic acid. From the exceptionally high relative stabilities of the mixed-ligand complexes containing β-alanine and aspartic acid, it is concluded that in these complexes the amino-acids occupy one equatorial and one axial site in the co-ordination sphere of the copper(II).

Original languageEnglish
Pages (from-to)1109-1111
Number of pages3
JournalJournal of the Chemical Society, Dalton Transactions
Issue number11
DOIs
Publication statusPublished - 1977

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Dipeptides
Alanine
Transition metals
Copper
Amino Acids
Peptides
Aspartic Acid
Glycylglycine
Aminobutyrates
Ornithine
Asparagine
Threonine
Ionic strength
Glutamine
Glycine
Serine
Lysine
Glutamic Acid
Ligands

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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abstract = "In a total of 39 equilibrium systems, the stability constants of mixed dipeptide-amino-acid complexes of copper(II) have been determined at 25 °C and ionic strength I = 0.2 mol dm-3 KCl. The dipeptides used are glycylglycine, glycyl-DL-α-alanine, and DL-α-alanyl-DL-α-alanine, and the amino-acids are glycine, α-alanine, α-aminobutyric acid, norvaline, β-alanine, serine, threonine, ornithine, lysine, asparagine, glutamine, aspartic acid, and glutamic acid. From the exceptionally high relative stabilities of the mixed-ligand complexes containing β-alanine and aspartic acid, it is concluded that in these complexes the amino-acids occupy one equatorial and one axial site in the co-ordination sphere of the copper(II).",
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AU - Gergely, Arthur

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N2 - In a total of 39 equilibrium systems, the stability constants of mixed dipeptide-amino-acid complexes of copper(II) have been determined at 25 °C and ionic strength I = 0.2 mol dm-3 KCl. The dipeptides used are glycylglycine, glycyl-DL-α-alanine, and DL-α-alanyl-DL-α-alanine, and the amino-acids are glycine, α-alanine, α-aminobutyric acid, norvaline, β-alanine, serine, threonine, ornithine, lysine, asparagine, glutamine, aspartic acid, and glutamic acid. From the exceptionally high relative stabilities of the mixed-ligand complexes containing β-alanine and aspartic acid, it is concluded that in these complexes the amino-acids occupy one equatorial and one axial site in the co-ordination sphere of the copper(II).

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