Syntheses, structural diversity and photocatalytic properties of two rare Ni(II) coordination polymers assembled by “V”-shaped dicarboxylates and bis(imidazolyl) ligands.

Two novel coordination polymers, namely {[Ni 2 (dpb)(Hdpb) 2 (4,4′-bbibp) 2 (H 2 O)]·H 2 O} ∞ ( 1 ) and [Ni(dpb)(bimb)(H 2 O)] ∞ ( 2 ) (H 2 dpb = 3,5-di(4′-carboxyl-phenyl)benzene acid, 4,4′-bbibp = 4.4′-bis(benzoimidazo-1-ly)biphenyl, bimb = 1.4-bis(imidazol-1-ylmethyl)benzene) have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Complex 1 shows a rare 1D meso -helical ladder chain, and the adjacent 1D irregular ladder chain forms a 3D supramolecular framework through the O H ⋯ O and C H ⋯ π interactions. Complex 2 exhibits an unprecedented 2-nodal (2,4)-connected 2D layer structure with the Schläfli point symbol (8 4 · 12 2 )(8 2 ), which are further assembled into a 3D supramolecular structure also by O H ⋯ O interactions. Furthermore, the photocatalytic properties of complexes 1 and 2 have been investigated. Interestingly, complex 2 not only shows an remarkable photocatalytic activity on RhB/MB degradation, but also has a better adsorption activity based on the bigger channel under magnetically stirred in the dark for 30 min. [ABSTRACT FROM AUTHOR]