Transition metal chelates derived from potassium nicotinoyldithiocarbazate(KHNDC)

Mononuclear and polynuclear chelates of nicotinoyldithiocarbazate (HNDC-) w ith 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, spectr al (UV-Visible, IR, NMR) and magnetic susceptibility measurements. The mola r conductivities of the complexes lie in the non-electrolyte range whilst K HNDC 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 aceta te-containing complexes.