Two Novel Crystal Structures of 2-Mercapto-1,3,4-thiadiazole Complexes with Mercury (II) Chloride

Two novel complexes 1 and 2 have been simultaneously obtained by the reaction of 2-mercapto-1,3,4- thiadiazole (MTD) with mercury (II) chloride (HgCl2) in CH3CN, and their crystal structures are characterized by single-crystal X-ray diffraction analysis. Crystal structures show that each Hg(II) of 1 is four coordinated with two chloride anions and two exocyclic sulfur atoms of two adjacent MTDs, and each Hg(II) of 2 is three coordinated with one chloride anion, one nitrogen atom and one exocyclic sulfur atom of two adjacent MTDs, respectively. Assisting the intermolecular works such as S center dot center dot center dot S, S center dot center dot center dot Cl or Hg center dot center dot center dot S interactions, both two complexes 1 and 2 are formed 2D supramolecular architectures. The results obtained conform the MTD can exist thiol and thione forms in the solid state.