Transition metal chelates derived from potassium nicotinoyldithiocarbazate (KHNDC)

Mononuclear and polynuclear chelates of nicotinoyldithiocarbazate (HNDC-) with Fe(III), Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cd(II), Hg(II), Pd(II), Cu(I) and Ag(I) have been prepared. The chelates have been characterized by chemical and thermal (TG, DTG, DTA) analyses, molar conductivity, spectral (UV-Visible, IR, NMR) and magnetic susceptibility measurements. The molar conductivities of the complexes lie in the non-electrolyte range whilst KHNDC is a 1:1 electrolyte. The IR spectral data show that KHNDC behaves in a monoanionic bidentate or tetradentate and dianionic tetradentate manner. The ligand field parameters (B, Dq, beta) for the Fe(III), Co(II) and Ni(II) complexes were calculated and related to the electronic environments. The solid metal acetate complexes have a unique decomposition exotherm profile which can be used as a rapid and sensitive tool for the detection of acetate-containing complexes.