Biomimetic complexes: thermal stability, kinetic study and decomposition mechanism of Co(II)-, Ni(II)- and Cu(II)-4(5)-hydroxymethyl-5(4)-methylimidazole complexes
| Autor: | Stefano Vecchio, S. Aquili, Krystyna Kurdziel, S. De Angelis Curtis, Stefano Materazzi, F. Sagone |
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| Rok vydání: | 2004 |
| Předmět: |
tga
coordination compounds Evolved gas analysis Thermal decomposition Inorganic chemistry hydroxymethyl-methylimidazole chemistry.chemical_element Condensed Matter Physics transition metal ions complexes Decomposition coupled tg-ft-ir Thermogravimetry imidazole derivatives chemistry.chemical_compound ega chemistry decomposition kinetics Hydroxymethyl Thermal stability Physical and Theoretical Chemistry Thermal analysis Instrumentation Cobalt |
| Zdroj: | Thermochimica Acta. 421:19-24 |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/j.tca.2004.02.020 |
| Popis: | A thermoanalytical study of 4(5)-hydroxymethyl-5(4)-methylimidazole complexes with divalent cobalt, nickel and copper, with a general formula ML 4 (NO 3 ) 2 is reported: the thermal stability and the decomposition steps were determined by thermogravimetry (TG) and derivative thermogravimetry (DTG). The released products, due to the thermal decomposition, were analyzed by on-line coupling a FT-IR spectrometer to the thermobalance; the so obtained evolved gas analysis (EGA) allowed to prove the proposed decomposition steps. The decomposition kinetics was examined by using the Flynn–Wall–Ozawa and Kissinger methods. From the former method the E dependencies were presented and connected with the corresponding steps mass loss; from the latter method the activation energies and the pre-exponential factor were computed. |
| Databáze: | OpenAIRE |
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