Thermodynamic study of the parent and mixed complexes of aspartic acid, glutamic acid and glycine with copper(II)

I. Nagypál, A. Gergely, E. Farkas

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Abstract

The equilibrium constants and in part the ΔH and ΔS data for the parent and mixed complexes copper(II)-aspartic acid, copper(II)-glutamic acid, copper(II)-aspartic acid-glycine, copper(II)-glutamic acid-glycine and copper(II)-aspartic acid-glutamic acid were determined pH-metrically and calorimetrically. Protonated complexes are formed in significant concentration in the copper(II)-aspartic acid and copper(II)-glutamic acid systems. The thermodynamic data led to the assumption that in the CuA complex of aspartic acid the β-carboxyl group of the ligand also forms a bond with the metal. The glutamic acid is bound "glycine-like" to the copper(II). There is an appreciable stabilization in the copper(II)-aspartic acid-glycine mixed complex, while in the copper(II)-glutamic acid-glycine system the stability of the mixed complex agrees with the statistical value. The above statements are supported by the dependence of the stability constants on the ionic strength.

Original languageEnglish
Pages (from-to)699-706
Number of pages8
JournalJournal of Inorganic and Nuclear Chemistry
Volume36
Issue number3
DOIs
Publication statusPublished - 1974

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aspartic acid
glutamic acid
glycine
Aspartic Acid
Glycine
Amino acids
Copper
Glutamic Acid
Thermodynamics
copper
thermodynamics
Acids
Equilibrium constants
carboxyl group
Ionic strength
Stabilization
stabilization
Metals
Ligands

Cite this

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title = "Thermodynamic study of the parent and mixed complexes of aspartic acid, glutamic acid and glycine with copper(II)",
abstract = "The equilibrium constants and in part the ΔH and ΔS data for the parent and mixed complexes copper(II)-aspartic acid, copper(II)-glutamic acid, copper(II)-aspartic acid-glycine, copper(II)-glutamic acid-glycine and copper(II)-aspartic acid-glutamic acid were determined pH-metrically and calorimetrically. Protonated complexes are formed in significant concentration in the copper(II)-aspartic acid and copper(II)-glutamic acid systems. The thermodynamic data led to the assumption that in the CuA complex of aspartic acid the β-carboxyl group of the ligand also forms a bond with the metal. The glutamic acid is bound {"}glycine-like{"} to the copper(II). There is an appreciable stabilization in the copper(II)-aspartic acid-glycine mixed complex, while in the copper(II)-glutamic acid-glycine system the stability of the mixed complex agrees with the statistical value. The above statements are supported by the dependence of the stability constants on the ionic strength.",
author = "I. Nagyp{\'a}l and A. Gergely and E. Farkas",
year = "1974",
doi = "10.1016/0022-1902(74)80137-5",
language = "English",
volume = "36",
pages = "699--706",
journal = "Polyhedron",
issn = "0277-5387",
publisher = "Elsevier Limited",
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TY - JOUR

T1 - Thermodynamic study of the parent and mixed complexes of aspartic acid, glutamic acid and glycine with copper(II)

AU - Nagypál, I.

AU - Gergely, A.

AU - Farkas, E.

PY - 1974

Y1 - 1974

N2 - The equilibrium constants and in part the ΔH and ΔS data for the parent and mixed complexes copper(II)-aspartic acid, copper(II)-glutamic acid, copper(II)-aspartic acid-glycine, copper(II)-glutamic acid-glycine and copper(II)-aspartic acid-glutamic acid were determined pH-metrically and calorimetrically. Protonated complexes are formed in significant concentration in the copper(II)-aspartic acid and copper(II)-glutamic acid systems. The thermodynamic data led to the assumption that in the CuA complex of aspartic acid the β-carboxyl group of the ligand also forms a bond with the metal. The glutamic acid is bound "glycine-like" to the copper(II). There is an appreciable stabilization in the copper(II)-aspartic acid-glycine mixed complex, while in the copper(II)-glutamic acid-glycine system the stability of the mixed complex agrees with the statistical value. The above statements are supported by the dependence of the stability constants on the ionic strength.

AB - The equilibrium constants and in part the ΔH and ΔS data for the parent and mixed complexes copper(II)-aspartic acid, copper(II)-glutamic acid, copper(II)-aspartic acid-glycine, copper(II)-glutamic acid-glycine and copper(II)-aspartic acid-glutamic acid were determined pH-metrically and calorimetrically. Protonated complexes are formed in significant concentration in the copper(II)-aspartic acid and copper(II)-glutamic acid systems. The thermodynamic data led to the assumption that in the CuA complex of aspartic acid the β-carboxyl group of the ligand also forms a bond with the metal. The glutamic acid is bound "glycine-like" to the copper(II). There is an appreciable stabilization in the copper(II)-aspartic acid-glycine mixed complex, while in the copper(II)-glutamic acid-glycine system the stability of the mixed complex agrees with the statistical value. The above statements are supported by the dependence of the stability constants on the ionic strength.

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U2 - 10.1016/0022-1902(74)80137-5

DO - 10.1016/0022-1902(74)80137-5

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VL - 36

SP - 699

EP - 706

JO - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 3

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