Synthesis and Characterization of Metal Complexes with Mixed 4-Imidazole-Containing Tripodal Ligand and Varied Dicarboxylic Acid

Six new metal–organic coordination polymers [Mn­(H3L)­(ox)]·H2O (1), [Zn2(H2L)­(pbdc)­(μ2-OH)]·2H2O (2), [Co­(H3L)­(obea)]·3H2O (3), [Ni­(H3L)­(pbea)] (4), [Co­(H3L)­(pbea)­(H2O)2] (5), and [Co4(H2L)2(pbea)3] (6) were synthesized by reactions of the corresponding metal salt with rigid tripodal ligand 1,3,5-tri­(1H-imidazol-4-yl)­benzene (H3L) and different dicarboxylic acid of oxalic acid (H2ox), 1,4-benzenedicarboxylic acid (H2pbdc), 1,2-phenylenediacetic acid (H2obea), 1,4-phenylenediacetic acid (H2pbea), respectively. The results of X-ray crystallographic analysis indicate that 1 and 3 are two-dimensional (2D) networks with 63-hcb topology, while 2 is (4,5)-connected three-dimensional (3D) net with Point (Schläfli) symbol of (42·52·72)­(42·53·74·8). Complex 4 is a binodal (3,4)-connected 2D network with V2O5-type topology. Complexes 5 and 6 were obtained through controlling reaction temperature, 5 features a one-dimensional (1D) chain, whereas 6 is an unprecedented tetra-nodal (3,4)-connected 3D net with Point (Schläfli) symbol of (4·62·103)­(4·62)­(4·64·8)2 attributable to the rich coordination modes of the ligands. The results of magnetic measurements showed that there are antiferromagnetic interactions in 1. Complex 2 exhibits intense light blue emission in the solid state at room temperature, while 3 shows water vapor adsorption property.