Solid State Kinetics from Thermogravimetry for Diodoquin Complexes of Barium, Magnesiurn and Cadmium

Department of Chemistry, Holkar Science College, Indore-4~2 001 (M. P.)

Manuscript received 3 August 1979, accepted 9 February 1980

Kinetic parameters, such as order of reaction, energy of activation and frequency factor are determined for the thermal decomposition of the complexes of Ba, 1\Jg and Cd with 5, 7 Diiodo-8-hydroxyquinoline (Diodoquin) (DIHQ) The method applied are Freeman-Carroll, Coats and Redfern and Horowitz and Metzger.

For the thermal decomposition of DIHQ, complexes of Ba, Mg and Cd, the nand E values are 0,~1 and 1 and 27.45. 18.06 and 18.72 Keats/mole by Freeman-Carroll method. The E and Z values by Coats and Redfern method are 28.76, 17.56 and 18.53 Keats/mole and 2.6 x 10⁵, 1.699 x 10² and 2.113 x 10² sec^-1, while the values of E and Z by Horowitz and Metzger method are 29.169, 17.603 and 18.453 Kcals/mole and 2.28 x 10⁵ , 1.58 x 10² and 2.00 x 10² sec^-1 respectively.