Main group metal halide complexes with sterically hindered thioureas. VIII. Complexes of lead(II) halides with 1,3-dimethyl-2(3H)-imidazolethione

Two new complexes of 1,3-dimethyl-2(3H)- imidazolethione (dmit) and lead(II) halides have been synthesized and characterized. Addition of dmit in molar excess to PbX2 (X = Cl, Br, I, SCN) solutions in hot water yielded PbCl2dmit and Pb(NCS)2(dmit)2. No adducts were isolated for PbBr2 or PbI2. Complexes were characterized via standard methods including both solid state and solution state information. Both complexes were high melting solids and appeared to be polymeric in the solid state, and IR data indicated polymerization occurred through halogen (of pseudohalogen) bridges only. Thiocyanate was N-bonded to the metal. Solution studies concluded that both were dissociated in DMF with PbCl2dmit being a non-electrolyte and Pb(NCS)2(dmit)2 acting like a 1:1 electrolyte.