Anion-directed assembly of metal–organic coordination complexes from 1,3-imidazolidine-2-thione ligand and silver salts

Five novel silver (Ι) complexes with 1,3-imidazolidine-2-thione ligand formulated as [Ag2(η1-SC3H6N2)6]SO4 (1), [Ag2(μ2-SC3H6N2)2(η1-SC3H6N2)4](NO3)2 (2), [Ag(μ2-SC3H6N2)Br]n (3), [Ag2(μ2-SC3H6N2)3(CH3COO)2]n (4), [Ag(μ2-SC3H6N2)Cl]n (5) have been synthesized under similar conditions except for different anions and solvents. They are structurally characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. Complex 1 is a binuclear complex, with SO42− anions as the counteranions. Complex 2 is a molecular binuclear silver cluster, with NO3− anions as the counteranions. Complex 3 shows a novel 2D lamella structure constructed by the S atom of 1,3-imidazolidine-2-thione ligand and Br− anions, and exhibits 12-membered metallacyclic rings in its structure. Complex 4 is a novel 2D layered polymer with a graphite-like array of silver (I) ions, with CH3COO− anion coordinated to silver(I) ions by O atom. Complex 5 shows a 3D diamond-like network structure constructed by the sulfur atom of 1,3-imidazolidine-2-thione ligand and Cl− anions.

Graphical abstractUsing 1,3-imidazolidine-2-thione and silver (I) salts, five anion-directed self-assemblies have been synthesized with their structures spanning zero, two and three dimensions. This work broadens the potential for synthesizing silver(I) coordination complexes on the basis of neutral heterocyclic thione ligands.Figure optionsDownload full-size imageDownload as PowerPoint slide