• Rijulal. G

Thermogravimetric measurements of complexes of seven lanthanide(III) ions, viz., La(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III) and Y(III) with 4-hydroxy-2,3-dimethyl-1- phenyl-3-pyrazolin-5-one (4-hydroxyantipyrine, abbreviated to hap) were recorded in dynamic air at a heating rate of 10oC min-1. All the complexes are thermally stable up to ~150°C, and undergo decomposition in three stages with the removal of one hap molecule in each step with the formation of Ln2O3 as the final residues. Phenomenological data kinetic parameters for the thermal decomposition reactions of the complexes have been calculated from the TG data using the Coats-Redfern equation. The kinetic parameters such as order parameter, energy of activation, pre-exponential factor and entropy of activation for all the three decomposition stages of each of the complexes have been calculated

Thermogravimetric analysis, 4-hydroxyantipyrine (hap), lanthanide(II) complexes, kinetic parameter

"Thermal Decomposition Studies of Lanthanide(II) Complexes with 4-Hydroxyantipyrine", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.3, Issue 11, page no.486-491, November-2016, Available :http://www.jetir.org/papers/JETIR1701A67.pdf

"Thermal Decomposition Studies of Lanthanide(II) Complexes with 4-Hydroxyantipyrine", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.3, Issue 11, page no. pp486-491, November-2016, Available at : http://www.jetir.org/papers/JETIR1701A67.pdf