Thermoanalytical study about histidine and cysteine-cadmium interactions

Infrared spectroscopy, thermogravimetry and differential scanning calorimetry techniques were used to study the metal-amino acid interactions for adducts of the general formula CdCl2·nL (n=1.0 or 1.5 and L=histidine or cysteine). After characterization the thermal degradation process was kinetically...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2003, Vol.74 (3), p.923-930
Main Authors: DE FARIAS, R. F, NUNES, L. M, AIROLDI, C
Format: Article
Language:English
Subjects:
Adducts
Amino acids
Cadmium chloride
Chemistry
Coordination compounds
Cysteine
Exact sciences and technology
Histidine
Inorganic chemistry and origins of life
Oxygen atoms
Preparations and properties
Thermal degradation
Thermodynamic properties
Thermogravimetry
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Summary:Infrared spectroscopy, thermogravimetry and differential scanning calorimetry techniques were used to study the metal-amino acid interactions for adducts of the general formula CdCl2·nL (n=1.0 or 1.5 and L=histidine or cysteine). After characterization the thermal degradation process was kinetically followed by a non-isothermal method. The infrared data confirmed that the cation is coordinated the carboxylic oxygen atoms of the amino acid molecules. The thermogravimetric results indicated that the main step of the thermal degradation of all amino acid adducts is connected to the rupture of the metal-ligand bonds, to give the associated activation energies values of 77, 44, 55 and 41 kJ mol-1 for CdCl2·nL, n=1.0 and 1.5, for histidine and cysteine, respectively.
ISSN:1388-6150
1588-2926
DOI:10.1023/B:JTAN.0000011024.89077.43