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Thermal decomposition Kinetics and mechanism of Co(II), Ni(II), and Cu(II) complexes derived from Anthracene carboxaldehyde L-Tyrosine

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Author Affiliations

  • 1Department of Chemistry, Zamorin’s Guruvayurappan College, Calicut, Kerala-673014, INDIA
  • 2M.A.M.O. College, Mukkam, Calicut, Kerala-673602, INDIA
  • 3Department of Chemistry (Retired), University of Calicut, Kerala, INDIA

Res.J.chem.sci., Volume 3, Issue (9), Pages 58-63, September,18 (2013)

Abstract

Cobalt(II), nickel(II), and copper(II) complexes of the Schiff base anthracene – 9 –carboxaldehyde - tyrosine were synthesized and characterized on the basis of elemental analysis, magnetic moment, molar conductance, UV- visible and IR spectra. Cobalt (II), nickel (II), and copper (II) complexes were subjected to thermal analysis to determine their thermal stability and decomposition pattern. The kinetic parameters like activation energy (E), frequency factor (A), entropy of activation (S), and order parameter (n) were calculated from TG curves using Coats Red fern and Horowitz Metzger equations. Evaluation of the reaction mechanism by non-iso thermal methods has been employed using the nine mechanistic equations. In all these cases the final products of decomposition were identified as respective oxides. The relative thermal stability of the chelates is in the order Co complex > Cu complex > Ni complex. The complexes of anthracene carboxaldehyde - tyrosine with Co(II) and Ni(II) having the formulae [M ACT (H O)] exhibited a one stage decomposition pattern in its TG curve. While [Cu ACT (H O)] gives a two stage decomposition pattern.

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