Metal complexes of starch dialdehyde dithiosemicarbazone

The Ca, Cd, Co (II), Cu (II), Fe (II), Mg, Mn (II), Ni (II), Pb (II), and Zn complexes of starch dialdehyde dithiosemicarbazone (DASTSC) of 14% oxidation were prepared and characterised. Based on the measured magnetic susceptibility for the Co (II) complex the low-spin character is ascribed to these complexes. The nitrogen atoms of the CN moiety as well as the sulphur atoms of the CS moiety are accepted as the coordination sites for the central metal atoms. Thermal analysis pointed two thermal effects on heating DASTSC up to its decomposition. The thermograms of DASTSC complexes contained three thermal effects in the same temperature region. One mole of a metal ion could coordinate with 1.1–65.4 mole of the ligand.