Structural Diversity in Oxadiazole-Containing Silver Complexes Dependent on the Anions

Abstract

Two coordination polymers, namely [Ag₂(L)(SO₃CF₃)(H₂O)](SO₃CF₃)•CH₂Cl₂ (1) and [Ag₅(L)₄(H₂O)₂](SbF₆)₅•5THF (2), were obtained by reacting oxadiazole-containing tri-armed ligand 1,3,5-tri(2-methylthio-1,3,4-oxadiazole-5yl) benzene (L) and silver salts in CH₂Cl₂/THF medium. The two complexes crystallized in the tetragonal space group I4₁/a and orthorhombic space group Fdd2, respectively. The Single-crystal X-ray diffraction revealed that the two complexes exhibit strikingly different 3D polymeric structures, which can be ascribed to the different counter anions. L in compound 1 acted as a hexa-dentate ligand, binding to two types of Ag⁺ atoms to form a 3D polymeric structure. L in compound 2 acted as a hexa- and penta-dentate ligand, binding to three types of Ag⁺ atoms to form the 3D polymeric structure. The antibacterial activity of the complexes was also investigated.