Synthesis, Structures, and Catalytic Properties of Two ­Cobalt(II) Coordination Polymers Based on 5-Substituted Isophthalate and Flexible Bis(benzimidazole) Co-ligands.

Two new Co^II coordination polymers, [Co(L₁)_0.5(hip)] _n ( 1) and [Co(L₂)(mip) ·2H₂O] _n ( 2) [L₁ = 1,1′-(1,4-butanediyl)bis-1H-benzimidazole, L₂ = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, H₂hip = 5-hydroxyisophthalic acid, H₂mip = 5-methylisophthalic acid], were synthesized under hydrothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complex 1 exhibits a 3D supramolecular network constructed with 2D (4,4) layer by O-H ···O hydrogen bonding. Complex 2 has 1D ladder-like chains, which are further assembled into a 3D supramolecular framework by π-π stacking interactions. In addition, fluorescence and catalytic properties of compounds 1 and 2 were investigated in solid state. [ABSTRACT FROM AUTHOR]