Thorium(IV) complexes of the type Th(NO3)4·3L·2C2H5OH, Th(SCN)4·L·C2H5OH and Th(SO4)2·2L·2C2H5OH (L=1-butyl-1-methylpiperazinium iodide(I) have been synthesised. From thermogravimetric (TG) curves, the decomposition pattern
of the compounds has been analysed. The order, activation energy and apparent activation entropy of the thermal decomposition
reaction have been elucidated. The heat of reaction has been calculated from differential thermal analysis (DTA) studies.