Physico-chemical investigations and thermal degradation behaviour of 4-ethylpiperazine-1-carbodithioic acid complexes of cobalt(II)

Some new cobalt(II) carbodithioates, viz. [Co(4-EtPipzcdtH)(m)]X-n (4-EtPipzcdtH = 4-ethylpiperazine-1-carbodithioic acid, X = Cl, Br, ClO4, NO3 and CH3COO when m = n = 2 and SO4, CO3 when m = 2 and n = 1), have been synthesized and characterized. Infrared and UV-Vis spectral data along with room temperature magnetic behaviour (2.50-2.85 B.M.) indicate chelating bidentate mode of coordination of ligand, 4-EtPipzcdtH with four coordination around Co(II). H-1 NMR and ESMS of [Co(4-EtPipzcdtH)(2)]Cl-2 further support its structure. Molar conductance study shows 1:2 electrolytic behaviour for complexes with Cl, Br, ClO4, NO3 and CH3COO as counter anions, while 1:1 electrolytic behaviour for CO3 and SO4 as counter anions. Ligand and its complexes have also been studied using non-isothermal techniques (TG and DSC). The anion has been found to play pronounced effect on the nature of thermal decomposition products. The DSC curves of the complexes displayed very sharp exothermic peaks.