Thermal studies of bis salicylidene adipic dihydrazone derivatives and their complexes with divalent ions of Mn, Co, Ni, Cu and Zn

The thermal stabilities of bis salicylidene adipic dihydrazone derivatives and their complexes with divalent Mn, Co, Ni, Cu and Zn were studied and discussed in terms of structure and type of metal ions. TG curves display mostly four steps of thermal decomposition. The first step is due to dehydrati...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2007-10, Vol.90 (1), p.261-267
Main Authors: ISSA, R. M, AMER, S. A, MANSOUR, I. A, ABDEL-MONSEF, A. I
Format: Article
Language:English
Subjects:
Chemistry
Coordination compounds
Exact sciences and technology
Inorganic chemistry and origins of life
Preparations and properties
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Summary:The thermal stabilities of bis salicylidene adipic dihydrazone derivatives and their complexes with divalent Mn, Co, Ni, Cu and Zn were studied and discussed in terms of structure and type of metal ions. TG curves display mostly four steps of thermal decomposition. The first step is due to dehydration, then the elimination of the acetate anions followed by the decomposition of the ligand in two interacting steps. The activation energies E a were evaluated and discussed in accordance with the structure of the complexes which have been previously characterized by elemental analysis and IR spectra. It was found that the activation energies of the complexes based on bis salicylidene adipic dihydrazone were higher than those of the dihydroxy derivative.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-006-7730-z