Effect of Carboxylate Coligands with Different Rigidity on Supramolecular Architectures Based on One Rigid Didentate Linear Ligand

Six new metal-organic frameworks, namely, {[Cd(bpbenz)(pim)] }(n) (1), {[Cd(bpbenz)(sea)]center dot(H2O)(2)}(n) (2), {[Cd(bpbenz)(hfipbb)]center dot(H2O)(3)}(n) (3), {[Co(bpbenz)(4,4'-sdb)]center dot(H2O)(2.75)}(n) (4), {[Ni(bpbenz)(4,4'-sdb) (H2O)(3)]center dot(H2O)(2)}(n) (5), and {[Co(bpbenz)(Hbtc)]center dot(H2O)}(n) (6), [bpbenz = 1,4-bis(4-pyridyl)benzene, pim = pimelic acid, sea = sebacylic acid, H(2)hfipbb = 4,4'-(hexafluoroisopropylidene)bis(benzoic acid), 4,4'-sdb = 4,4'-sulfonyldibenzoate, H(3)btc = 1,3,5-benzenetricarboxylate, and DMF = N,N-dimethylacetamide], have been synthesized under hydrothermal conditions. These compounds were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Compound 1 is a 3D network composed of layers of pentagonal-bipyramidal coordinated Cd atoms bridged by pimelic anions in syn-anti configurations and bpbenz molecules between layers with {4(12).6(3)} pcu topology. In compound 2, the bpbenz and sebacylic anions act as bidentate ligands assembling with Cd(NO3)(2) to a 2D framework. Compound 3 is a 2D network composed of chains, which is bridged by the [Cd-2(CO2)(4)](2)L-2 SBUs and hfipbb(2-) anions, and with bpbenz molecules between chains. For compound 4, the bpbenz and 4,4'-sdb coordinate to Co cations to form a three-dimensional{6(5).8} cds uninodal network. Compound 5 features 2D structure with inclined polycatenation (1D + 1D -> 2D). For compound 6, a 2D network with side arms leads to the formation of a polythreaded network, which exhibits a 2-fold interpenetrating 3D array if H-bonds are taken into account. Magnetic susceptibility measurements indicate that compounds 4 and 6 have dominating antiferromagnetic couplings between metal ions. Furthermore, thermal stabilities for 1-6 and luminescent properties for 1-3 are also discussed in detail.