Construction of five dicyanamide based coordination polymers with diverse dimensionality: Synthesis, characterization and photoluminescence study

A family of dicyanamide bridged compounds namely {[Co(dca)4(2-abim)2]}n (1), {[Ni(dca)4(2-abim)2]}n (2), {[Cd(dca)4(2-abim)2]}n (3), {[Zn(N(CN)2)2(4-bpdb)]}n (4) and {[Cd(N(CN)2)2(4-bpdb)]}n (5); [where dca = dicyanamide, 2-abim = 2-aminobenzimidazole and 4-bpdb = 1,4-bis-(4-pyridyl)-2,3-diaza-1,3-butadiene] have been synthesized by stirring at room temperature. These compounds have been characterized by single crystal diffraction analysis, infrared spectroscopy (IR) and powder X-ray diffraction (PXRD). Complexes 1–3 are isostructural and exhibit two-dimensional (2D) metal-dca sheet with pendant 2-abim ligand. Compound 4 forms [Zn(N(CN)2)]n chains with a pendent dca and a bridging dca linker, which are further connected by bridging 4-bpdb ligands extending into a 2D layer structure. In case of compound 5 each Cd(II) centers connect with four bridging dca linkers to form [Cd(N(CN)2)]n double chains, which are further connected by bridging 4-bpdb ligands extending into a 2D layer structure. Here [Cd2(N(CN)2)] and 4-bpdb spacer are interpenetrated to each other and resemble polyrotaxane-type structures. Photoluminescent properties of compounds 3–5 were also studied and they exhibit nice ligands based photoluminescence properties at room temperature.

Five dicyanamide based coordination polymers of diverse dimensionality have been synthesized and characterized by X-ray diffraction and photoluminescence study.Figure optionsDownload as PowerPoint slide