Thermodynamic and structural study of the parent and some mixed ligand complexes of histamine and 1,3-diaminopropane with copper(II) and nickel(II) ions

A. Gergely, I. Sóvágó

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Abstract

ph-metric equilibrium studies were used to determine the stability constants of the coppper(II) and nickel(II) complexes of histamine and 1,3-diaminopropane. In the copper(II)-histamine system it was found that, in addition to the parent complexes CuA2+ and CuA2+2, a protonated complex CuA2H3+ and mixed hydroxo complexes Cu2A2(OH)2+2 and CuAOH+n are also formed. The protonated complex CuA2H3+ is formed in the case of a higher ligand excess at around pH = 5-6, and it is probable that one of the imidazole N atoms does not take part in the coordinate bonding. Electron excitation and ESR spectral data related that a certain distortion of the bonds must be reckoned with in the copper(II)-histamine complex of composition CuA2+2, because of steric reasons, and this phenomenon increases the stability of the mixed ligand complexes.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalInorganica Chimica Acta
Volume20
Issue numberC
DOIs
Publication statusPublished - 1976

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histamines
Nickel
Thermodynamics
Histamine
Copper
Ligands
nickel
Ions
copper
thermodynamics
ligands
Paramagnetic resonance
ions
imidazoles
Atoms
Electrons
Chemical analysis
excitation
atoms
trimethylenediamine

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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title = "Thermodynamic and structural study of the parent and some mixed ligand complexes of histamine and 1,3-diaminopropane with copper(II) and nickel(II) ions",
abstract = "ph-metric equilibrium studies were used to determine the stability constants of the coppper(II) and nickel(II) complexes of histamine and 1,3-diaminopropane. In the copper(II)-histamine system it was found that, in addition to the parent complexes CuA2+ and CuA2+2, a protonated complex CuA2H3+ and mixed hydroxo complexes Cu2A2(OH)2+2 and CuAOH+n are also formed. The protonated complex CuA2H3+ is formed in the case of a higher ligand excess at around pH = 5-6, and it is probable that one of the imidazole N atoms does not take part in the coordinate bonding. Electron excitation and ESR spectral data related that a certain distortion of the bonds must be reckoned with in the copper(II)-histamine complex of composition CuA2+2, because of steric reasons, and this phenomenon increases the stability of the mixed ligand complexes.",
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TY - JOUR

T1 - Thermodynamic and structural study of the parent and some mixed ligand complexes of histamine and 1,3-diaminopropane with copper(II) and nickel(II) ions

AU - Gergely, A.

AU - Sóvágó, I.

PY - 1976

Y1 - 1976

N2 - ph-metric equilibrium studies were used to determine the stability constants of the coppper(II) and nickel(II) complexes of histamine and 1,3-diaminopropane. In the copper(II)-histamine system it was found that, in addition to the parent complexes CuA2+ and CuA2+2, a protonated complex CuA2H3+ and mixed hydroxo complexes Cu2A2(OH)2+2 and CuAOH+n are also formed. The protonated complex CuA2H3+ is formed in the case of a higher ligand excess at around pH = 5-6, and it is probable that one of the imidazole N atoms does not take part in the coordinate bonding. Electron excitation and ESR spectral data related that a certain distortion of the bonds must be reckoned with in the copper(II)-histamine complex of composition CuA2+2, because of steric reasons, and this phenomenon increases the stability of the mixed ligand complexes.

AB - ph-metric equilibrium studies were used to determine the stability constants of the coppper(II) and nickel(II) complexes of histamine and 1,3-diaminopropane. In the copper(II)-histamine system it was found that, in addition to the parent complexes CuA2+ and CuA2+2, a protonated complex CuA2H3+ and mixed hydroxo complexes Cu2A2(OH)2+2 and CuAOH+n are also formed. The protonated complex CuA2H3+ is formed in the case of a higher ligand excess at around pH = 5-6, and it is probable that one of the imidazole N atoms does not take part in the coordinate bonding. Electron excitation and ESR spectral data related that a certain distortion of the bonds must be reckoned with in the copper(II)-histamine complex of composition CuA2+2, because of steric reasons, and this phenomenon increases the stability of the mixed ligand complexes.

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JF - Inorganica Chimica Acta

SN - 0020-1693

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