Synthesis, spectral and thermal studies of 2,2′-bipyridyl adducts of bis(N-alkyl-N-phenyldithiocarbamato)zinc(II)

Three Zn(II) adducts of N-alkyl-N-phenyl dithiocarbamate with 2,2′-bipyridine have been synthesized and characterized by elemental analysis and spectroscopic techniques. The compounds are formulated as [Zn(mpdtc)2bpy] (1), [Zn(epdtc)2bpy] (2), and [Zn(bpdtc)2bpy] (3) (where m = methyl, e = ethyl, b = butyl; p = phenyl and bpy = 2,2′-bipyridine). The single crystal X-ray structures of compounds (1) and (2) are also reported. It revealed that compound (1) exists as a five coordinate trigonal bipyramidal structures in which one dithiocarbamate acts as a chelating ligand and the other occupying the apical position acts as a monodentate ligand, while compound (2) exists as six coordinate octahedral species. Each of the two compounds has four molecules in the unit cell with the uncoordinated S atom in complex 1 involved in a weak C–H⋯S interaction. The thermal decomposition profiles of the compounds are also reported.