Two Cd(II) coordination polymers containing bis(benzimidazole) ligands as luminescent probes for acetylacetone and Fe3+ ions

Abstract

Two new ternary coordination polymers (CPs), [Cd0.5(TBTA)0.5(L1)]n (1) and [Cd(TBTA)(L2)(H2O)]n (2) (L1 = 1,3-bis(2-methylbenzimidazol-1-yl)-2-propanol, L2 = 1,2-bis(benzimidazol-1-ylmethyl)benzene, H2TBTA = tetrabromoterephthalic acid) were prepared under the hydrothermal condition. 1 possesses a 1D infinite chain. 2 features a 4-connect sql layer with point symbol of {44.62}. Both 1 and 2 are further extended into the 3D supramolecular networks via OH⋯N and OH⋯O hydrogen-bonding interactions, respectively. The structural variety of the Cd(II) ternary CPs demonstrates that different N-containing ligands play great influence on the final topological network. Luminescence titration results display that 1 and 2 are dual-responsive probes for detection of acetylacetone (acac) and Fe3+ ions.