Zinc(II) and Cadmium(II) Complexes with Rigid 3,3′,5,5′-Tetra(1H-imidazol-1-yl)-1,1′-biphenyl and Varied Carboxylate Ligands

Six new coordination polymers [Zn(L)(0.5)(CO3)]center dot H2O (1), [Zn-(L)(0.5)(DC)]center dot H2O (2), [Cd(L)(0.5)(DC)] (3), [Cd(L)(0.5)(PBEA)]center dot H2O (4), [Cd-2(L)-(MBEA)(2)]center dot 4H(2)O (5), and [Zn(L)(0.5)(MBEA)]center dot 2H(2)O (6) with different structures and topologies were successfully synthesized by hydrothermal reactions of zinc(II)/cadmium(II) salts with rigid ligand 3,3',5,5'-tetra(1H-imidazol-1-yl)-1,1'-biphenyl (L) and auxiliary multicarboxylic acids of 1,3,5-tri(4-carboxyphenyl)benzene (H3BTB), 1,4-benzenediacrylic acid (H2DC), 1,4-benzenediacetic acid (H(2)PBEA), and 1,3-benzenediacetic acid (H(2)MBEA), respectively. Carbonate anion, rather than the carboxylate anion of H3BTB, is incorporated in 1. Complexes 1 and 5 are (4,4)- and (4,6)-connected binodal two-dimensional (2D) networks with a point (Schlafli) symbol of (4.6(4).8)(2)(4(2).6(4)) and (3(2).4(2).5(2))(3(4).4(4).5(4).6(3)), respectively. Complex 2 is a self-penetrating three-dimensional (3D) framework with a point (Schlafli) symbol of (6(2).8(4))(6(4).8(2))(2), while 3 shows a (3,4,5)-connected trinodal 3D framework with a point (Schlafli) symbol of (4.6(3).8(6))(2)(4(2).8(4))(6(3))(2). The 3-fold interpenetrating net of 4 is a subnet of sta with a point (Schlafli) symbol of (4.6(4).8)(2)(4(2).6(2).8(2)), while the net of 6 is vested in nbo set net with a point (Schlafli) symbol of (6(4))(8(2)). The results show that the auxiliary ligands and metal centers play important roles in the formation of complexes with diverse structures. Furthermore, the thermal stability, photoluminescence, and sorption properties of the complexes were investigated.