Thermal behaviour of new zinc(II) bromobutyrate complex compounds

New zinc bromobutyrate complexes of general formula ZnX2. 1-2L . nH(2)O (X = CH2Br(CH2)(2)COO-; CH3CH2CHBrCOO-) containing one or two molecules of caffeine, nicotinamide and phenazone as ligands (L) were prepared. The compounds were characterized by MS-, IR- spectroscopy, chemical and thermal analysis. The thermal decomposition of hydrated compounds starts by the release of water molecules. In anhydrous compounds the loss of organic ligands takes place followed by the decomposition of the bromobutyrate anion at higher temperatures. Zinc bromide was found among the final products of thermal decomposition. Water, carbon monoxide, propylaldehyde, vinylaldehyde and formaldehyde were detected in the gaseous products of the thermally decomposed samples on hearing up to 700 degrees C.