Infrared study of the heating effects of Ni, Cd and Co complexes of sulfadimethoxine

The Ni and new Cd and Co complexes of sulfadimethoxine (SDMX) are prepared and investigated their structural changes and stability by heating at diffe rent temperatures. The investigations were carried out by means of the infr ared spectroscopy (IR) after heating the samples at several temperatures in the range 50-300 degrees C for an hour. The IR spectra of the heated sampl es at different temperatures have been compared with those at room temperat ure The changes in the fundamental vibrational bands in their IR spectra ga ve the temperature values at which the samples decomposited, As a result, i t is found that the stability of the complexes are higher than SDMX and the ir stability is in the order Ni > Co > Cd which depends on the second ioniz ation potential of the metals.