A Study on Solid State Thermal Decomposition Characteristics of Some Metallo-organic Compounds. PartI : Dehydration and Decarboxylation of Hydrated Calcium Salts of Pyridine Monocarboxylic Acids
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Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Caloutta-700 092
Manuscript received 20 August 1981, revised 26 January 1982, accepted 23 May 1982
Solid state dehydration of hydrated calcium salts of picolinic acid, nicotinic acid and isonicotinic acid and subsequent decarboxylation of the corresponding anhydrous salts have been studied by simultaneous TG, DTA and DTG techniques. From the analysis of the TG, DTA and DIG traces for the dehydration of the hydrated salts, the thermal stability order of the hydrates has been found to be Ca(pic)2,H2O> Ca(isoNic)2 4H2O > Ca(Nic)2,3H2O. But the trend observed in the decarboxylation process is Ca(Nic)2 > Ca(isoNic)2 > Ca(pic)2, Thermal parameters like activation energy, enthalpy change and order of reaction for each process have been computed by standard methods. An attempt has been made to correlate the trend in the thermal stability of the anhydrous salts towards decarboxylation with their molecular structure.
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