Template synthesis of symmetrical transition metal dithiocarbamates

Novel transition metal dithiocarbamates of the type [M-2(etdtc)(2)] and [M-1(etdtc)Cl](2) where M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II), M-1 = Cr(III), Fe(III) and etdtc = (S4N4C11H18) have been synthesized by the use of self-assembly techniques. The metal dithiocarbamates were prepared from the primary amine, CS2 and metal chloride. They have been characterized by spectroscopic, TGA/DSC, magnetic susceptibility and conductivity data. The complexes, [Mn-2(etdtc)(2)], [Fe-2(etdtc)(2)], [Co-2(etdtc)(2)], [Zn-2(etdtc)(2)], [Cd-2(etdtc)(2)] and [Hg-2(etdtc)(2)] have been suggested to be tetrahedral while [Ni-2(etdtc)(2)] and [Cu-2(etdtc)(2)] have square-planar geometry. [Cr(etdtc)Cl](2) and [Fe(etdtc)Cl](2) have chlorine bridged distorted-octahedral geometry. It has been observed that the dithiocarbamato moiety is symmetrically bonded in all the cases. A three stage TGA profile is observed for all the complexes leading to the formation of respective metal sulfide as the end-product. The molar conductance of 10(-3) mol L-1 solution of the complexes measured in DMSO is indicative of their non-ionic nature.