Structural diversification and photocatalytic properties of zinc(II) polymers modified by auxiliary N-containing ligands

Four new coordination polymers, {[Zn(bismip)center dot 2H(2)O)(n) (1), {[Zn-2(bismip)(2)(4,4'-bipy)]center dot 2H(2)O)(n) (2), {Zn-2(bismip)(2)(phen))(n) (3) and {[Zn(bismip)(bimb)](2)center dot 2H(2)O center dot DMF)(n) (4) (H(2)bismip = 5-(1H-benzoimidazol-2-yl-sulfanylmethyp-isophthalic acid, 4,4'-bipy = 4,4'-bipyridine, phen = 1,10-phenanthroline, bimb = 4,4-bis(1-imidazolyl)bibenzene) were synthesized under solvothermal conditions. All these compounds were characterized by elemental analysis, IR spectroscopy, thermal analysis, powder X-ray diffraction and single-crystal X-ray diffraction. Compound 1 features a two-dimensional (2D) binodal (3,6)-connected kgd network with (4(3))(2)(4(6).6(6).8(3)) topology. 2 exhibits two-fold interpenetrating 3D architecture with a (4.8(2))(4(2).8(4),) Schlafli symbol in which 2D layers are interlinked by 4,4-bipy ligands. In 3, the [Zn-4(bismip)(4)] and [ZnO4N2] units are interconnected, affording a binodal 3D (3,4)-connected network with the Schlafli symbol (8(3))(8(6)). 4 is a 2D (3,4)-connected coordination network with (4(2).6)(4(2).6(3).8) topology. The photoluminescence properties and photocatalytic properties of these compounds were also investigated.