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. (C) 2004 Elsevier B.V. All rights reserved.
Biomimetic complexes: thermal stability, kinetic study and decomposition mechanism of Co(II)-, Ni(II)- and Cu(II)-4(5)-hydroxymethyl-5(4)-methylimidazole complexes / Materazzi, Stefano; S., Aquili; S., De Angelis Curtis; VECCHIO CIPRIOTI, Stefano; K., Kurdziel; F., Sagone. - In: THERMOCHIMICA ACTA. - ISSN 0040-6031. - 421:1-2(2004), pp. 19-24. [10.1016/j.tca.2004.02.020]
Biomimetic complexes: thermal stability, kinetic study and decomposition mechanism of Co(II)-, Ni(II)- and Cu(II)-4(5)-hydroxymethyl-5(4)-methylimidazole complexes
MATERAZZI, Stefano;VECCHIO CIPRIOTI, Stefano;
2004
Abstract
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. (C) 2004 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
