Construction of coordination frameworks based on 4-imidazolyl tecton 1,4-di(1H-imidazol-4-yl)benzene and varied carboxylic acids

Nine new coordination polymers [Mn(L)(OX)] (1), [Zn(L)(MBDC)] (2), [Zn(L)(BPDA)] (3), [Co-3(L)(2)(BTA)(2)]center dot 2H(2)O (4), [Co-2(L)(2)(BTCA)]center dot 2H(2)O (5), [Ni(L)(e,a-cis-1,2-CHDC)]center dot 2H(2)O (6), [Co(L)(e,a-cis-1,4-CHDC)] (7), [Co(L)(e,e-trans-1,4-CHDC)]center dot 2H(2)O (8) and [Co(L)(e,e,e-cis-1,3,5-HCHTC)]center dot 0.45H(2)O (9) were obtained by reactions of varied metal salts with 1,4-di(1H-imidazol-4-yl) benzene (L) in the presence of corresponding auxiliary ligands of oxalic acid (H2OX), 5-methyl-1,3-benzenedicarboxylic acid (H2MBDC), 4,4'-biphenyldicarboxylic acid (H(2)BPDA), benzene-1,3,5-triacetic acid (H(3)BTA), 1,2,4,5-benzenetetracarboxylic acid (H(4)BTCA), cis-1,2-cyclohexanedicarboxylic acid (cis-1,2-H2CHDC), cis-/trans-1,4-cyclohexanedicarboxylic acid (cis-/trans-1,4-H2CHDC) and cis-1,3,5-cyclohexane tricarboxylic acid (cis-1,3,5-H3CHTC), respectively. Complex 1 has a one-dimensional (1D) chain structure and 2 has a two-dimensional (2D) network with 6(3)-hcb topology. Complex 3 is a complicated uninodal 4-connected three-dimensional (3D) net with Point (Schlafli) symbol (4.6.8(3).10)(4.6(3).8(2))(6(3).10(3))(6(4).8(2)) while 4 is a (3,8)-connected tfz-d 3D net with Point (Schlafli) symbol (4(3))(2)(4(6).6(18).8(4)) based on the trinuclear Co(II) secondary building units (SBUs). Complex 5 is a 3-fold interpenetrating mog net with Point (Schlafli) symbol of (4.6(4).8)(2)(4(2).6(2).8(2)), while 6 is a 2D net with (4,4) topology based on binuclear SBUs. In contrast to the 2D network of 7 with e,a-cis-1,4-CHDC2-, 8 with e,e-trans-1,4-CHDC2- is a 5-fold interpenetrating 6(6)-dia 3D net. Complex 9 has a 1D ladder-like chain structure with a stable conformation from the e,e,e-cis-1,3,5-HCHTC2- ligand. Complexes 2 and 3 exhibit intense light blue emission in the solid state at room temperature and the results of magnetic measurements showed that there are antiferromagnetic interactions in 1.