Two new cobalt(II) MOFs, namely [Co2(L)2(4,4′-bipy)]n (1) and {[Co(L)(dib)0.5(H2O)2]·H2O}n (2) were obtained by the self-assembly of Co(NO3)2·6H2O with V-shaped 2,4-[6-(4-carboxyphenyl)pyrazin-2-yl]benzoic acid (H2L) in the presence of two bridging auxiliary N-donor...

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Two new complexes based on 4,4′‐[1,3‐phenylenebis(oxy)]diphthalic acid (H4L) ligands were synthesized, namely, [Cd2(L)(1,10‐phen)2(H2O)]n(1) and [Co2(L)(1,10‐phen)2(H2O)]n(2), in which 2D structures transform into 3D supramolecular structures by CH···π interaction. The proton conductivity of complexes 1 and 2 at low temperature is close (σ1 = 3.12 × 10−8 S cm−1 and σ2 = 3.81 × 10−8 S cm−1 at 30°C), but these two complexes show different conduction mechanisms. The Vehicular mechanism in 1 is caused by the O···H/H···O contact in 1, which is stronger than 2, and the Grotthuss mechanism in 2 is caused by the N···H/H···N contact in 2, which is stronger than 1. At the same time, complex 1 showed excellent antibacterial properties in vitro, mainly reflected in that five kinds of bacteria (Escherichia coli, Bacillus amyloliquefaciens, Pantoea agglomerans, Pseudomonas putida, and Pectobacterium carotovora) could play an obvious inhibitory effect in the concentration range of 20 μg·ml−1.

Four novel metal–organic frameworks constructed from benzimidazole flexible tetracarboxylic acid ligand, 1‐(3,5‐dicarboxylbenzyl)‐1H‐benzimidazole‐5,6‐dicarboxylic acid (H4L), have been prepared by a solvothermal method in the presence of N‐donor ancillary ligands (1,10‐phen = 1,10‐phenanthroline monohydrate, 4,4′‐bibp = 1,4‐di[pyridine‐4‐yl]benzene), namely, [Co2(L)(H2O)3]n (1), {[Cd2(L)(1,10‐phen)(H2O)]·2H2O}n (2), {[Co4(L)2(4,4′‐bibp)2(H2O)7]·4H2O}n (3), and {[Ni4(L)2(4,4′‐bibp)2(H2O)7]·4H2O}n (4). Complexes 1 and 2 show a 3D supramolecular structure and crystallize in monoclinic space group P21/c. Complexes 3 and 4 are isomorphous and crystallize in monoclinic space group Pn, and the respective metals exhibit a similar coordination environment. The H4L ligand behaved in different coordinated modes in Complexes 1–4, namely, μ6‐η1:η1:η1:η0:η1:η1:η1:η1:η1 in 1, μ6‐η1:η1:η1:η1:η1:η1:η2:η1:η1 in 2, there are two coordination modes (μ5‐η0:η1:η1:η0:η1:η1:η1:η0:η1 and μ5‐η1:η1:η1:η0:η1:η1:η1:η0:η1) in 3 and 4. Furthermore, photoluminescence and magnetic properties have been studied. The results indicate that Complexes 3 and 4 show strong antiferromagnetic and ferromagnetic coupling through M–O–C–O–M interactions, respectively. In particular, Complex 2 can sensitively and selectively detect Fe3+ in aqueous systems, and the limit of detection (LOD) values of Fe3+ is ∼0.19 mM.