Anion-dependent construction of three Cd(II) coordination polymers containing helical chains: Structures and luminescence properties

• Three anion-dependent Cd(II) coordination polymers based on HPyBIE are constructed.
• All the compounds are 2D networks containing 1D helical SBUs.
• The helicity of helical chain is dependent on the chiral conformations of organic ligands.

Three new coordination polymers, [Cd(μ3-PyBIE)(NO3)]n (1), [Cd(μ2-HPyBIE)2(ClO4)2]n (2) and {[Cd1.5(μ2-HPyBIE)Cl3]·2H2O}n (3), were synthesized by the solvothermal reactions of a new benzimidazole derivative ligand, 1-(1-(pyridin-4-ylmethyl)-1H-benzoimidazol-2-yl)ethanol (HPyBIE). Crystal structure analysis showed that all the compounds were two-dimensional (2D) layer structures based on 1D helical secondary building units (SBUs). The helicity of 1D helical chain is dependent on the chiral conformation of HPyBIE ligand. Investigation of their structural diversity reveals that anions play an important role in the assembly procedure. Furthermore, the luminescence properties of compounds 1–3 were also studied.

Three anion-dependent Cd(II) coordination polymers based on 1D helical secondary building units were constructed. The correlations among the chirality of building unit and the helicity of helical chain were investigated.Figure optionsDownload as PowerPoint slide