Mixed cobalt(III) complexes with aromatic amino acids and diamine
| Autor: | Dragica M. Minić, D. U. Skala, M.J. Malinar, Z.M. Miodragović, Katarina Andjelkovic, Dj.U. Miodragović |
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| Rok vydání: | 2005 |
| Předmět: |
0303 health sciences
Ligand Stereochemistry Diastereomer chemistry.chemical_element Ethylenediamine 010402 general chemistry Condensed Matter Physics 01 natural sciences 0104 chemical sciences Thermogravimetry 03 medical and health sciences chemistry.chemical_compound chemistry Diamine Polymer chemistry Side chain Physical and Theoretical Chemistry Thermal analysis Instrumentation Cobalt 030304 developmental biology |
| Zdroj: | Thermochimica Acta. 436:90-95 |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/j.tca.2004.07.007 |
| Popis: | Thermal properties of (1,2-diaminoethane) bis ( S -tyrosinato)cobalt(III) complex diastereomers are investigated by means of TG technique in 293–873 K temperature range. This is a first thermal study of [Co( S -aa) 2 en] + ( S -aa = anion of S -amino acid; en = 1,2-diaminoethane) complex diastereomers. It is shown that thermal decompositions of these complexes are multi-step degradation processes, which in some cases can be satisfactory separated into individual steps, depending on the molecular symmetry. It is proposed that the degradation processes occur with cleavage of the side chain of one S -tyrosinato ligand, followed by the cleavage of the second side chain by further heating. The proposed pathways of decomposition are in accordance with results of thermal degradation of noncoordinated S -tyrosine [F. Rodante, G. Marrosu, G. Catalani, Thermochim. Acta 194 (1992) 197–213]. In the case of diastereomers which crystallize with water molecules, the departure of both hygroscopic and crystal water occurs before. The corresponding kinetic and thermodynamic parameters of some processes were determined. |
| Databáze: | OpenAIRE |
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