Abstract
The thermal decomposition kinetics of sterically hindered salen type ligand (L) and its metal complexes [M=Co(II), Ni(II), Cu(II)] were investigated by thermogravimetric analysis. A direct insertion probe-mass spectrometer (DIP-MS) was used for the characterization of metal complexes of L and all fragmentations and stable ions were characterized. The thermogravimetry and differential thermogravimetry (TG-DTG) plots of salen type salicylaldimine ligand and complexes showed a single step.
The kinetic analysis of thermogravimetric data was performed by using the invariant kinetic parameter method (IKP). The values of the invariant activation energy, E inv and the invariant pre-exponential factor, A inv, were calculated by using Coats-Redfern (CR) method. The thermal stabilities and activation energies of metal complexes of sterically hindered salen type ligand (L) were found as Co(II)>Cu(II)>Ni(II)>L and E Cu>E Ni>E Co>L. Also, the probabilities of decomposition functions were investigated. The diffusion functions (D n) are most probable for the thermal decomposition of all complexes.
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Doğan, F., Ulusoy, M., Öztürk, Ö.F. et al. Thermal studies of Co(II), Ni(II) and Cu(II) complexes of N,N′-bis(3,5-Di-t-butylsalicylidene)ethylenediamine. J Therm Anal Calorim 96, 267–276 (2009). https://doi.org/10.1007/s10973-008-8980-8
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DOI: https://doi.org/10.1007/s10973-008-8980-8