Thermal Studies of Co(II), Ni(II) and Cu(II) Complexes of N,N'-bis(3,5-Di-t-Butylsalicylidene)Ethylenediamine


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.


Materials Science and Engineering

Keywords and Phrases

Activation energy; Sterically hindered; Schiff base; Thermal decomposition; kinetic; Thermogravimetry

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Document Type

Article - Journal

Document Version


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© 2009 Springer Netherlands, All rights reserved.

Publication Date

01 Apr 2009