Thermal analysis studies on pyridine carboxylic acid complexes of zinc(II)

Compounds of zinc with picolinic acid, nicotinic acid and isonicotinic acid have been prepared. The thermal behaviour of these compounds together with that of the free pyridine carboxylic acids has been studied by thermogravimetry and differential thermal analysis. The metal complexes which are all hydrated lose water, followed by loss of the organic ligand to give zinc(II) oxide. The IR spectra of the compounds are also discussed.