Abstract

Wilma Cyril¹, B. Suresh Kumar² and D. Sobhana²

The thermal properties of copper (II) 8- hydroxy quinoline -5 sulphonic acid has been investigated. The thermal decomposition occurs in three stages. All the three stages of decomposition follow one after the other without any stable compound in between showing that the complex is volatile. The kinetics of the thermal decomposition of the complex has been studied using thermogravimetry (TG) in conjunction with DTG. The equations used are Coats-Redfern(CR) and Madusoodanan-Krishnan-Ninan(MKN) methods. The entropy of activation is negative for the first two stages showing that the compounds are more ordered in the activated state compared to the reactants. The positive value of DS for the third stage indicates irreversibility. The order of the reaction is 2.

Entropy of activation; Coats-Redfern equation; MKN method

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