Synthesis, characterization, and spectral and thermal studies of some divalent transition metal complexes of benzylpiperazine dithiocarbamate

Potassium benzylpiperazine dithiocarbamate (KBPDTC) and its complexes with Mn(II), Co(H), Ni(H), Cu(II) and Zn(II) have been synthesized and characterized. On the basis of elemental analyses, magnetic moments and spectral data, the monoanionic BPDTC ligand coordinates to the metal ions via both sulfur atoms of the -NCS2 group, acting as a bidentate ligand. The Ni(H) complex has a square-planar coordination geometry, while the other complexes are suggested to exhibit a square-pyramidal coordination environment. The thermal reactivity of KBPDTC.H2O and its metal complexes has been studied by means of DTA and TG techniques. Thermoanalytical data show that decomposition of the metal complexes of KBPDTC under nitrogen gives the corresponding metal thiocyanates as stable solid intermediates.