Four cobalt(ii) coordination polymers with diverse topologies derived from flexible bis(benzimidazole) and aromatic dicarboxylic acids: syntheses, crystal structures and catalytic properties

Abstract

Four metal–organic frameworks (MOFs) were obtained from the hydrothermal reaction of Co(ii) and with dicarboxylic acid and flexible bis(5,6-dimethylbenzimidazole) and characterized. The four MOFs exhibit distinct 2D or 3D structural frameworks.

Effect of Flexible Bis(Benzimidazole) Ligands on the Structures of Cobalt(II) Coordination Polymers Derived from 2,6‐Naphthalenedicarboxylic Acid

“…All coordinated bonds are within normal distances. [25,26] The completely deprotonated nda 2-ligands adopt μ 2 -η 1 :η 1 -bidentate bridging through two carboxyl oxygen atoms con-necting the adjacent Co atoms along the bc direction to give rise to 1D zigzag chain with two kinds of Co1···Co1 separations of 13.3753(8) Å and 13.2148(8) Å and a Co1···Co1···Co1 angle of 100.759(3)° (Figure 1b). The difference observed in the Co1···Co1 separation by nda ligands can be attributed to slight adjustment in the coordination process between carboxylate groups and central Co atoms.…”

Synthesis, structures and luminescence properties of two mixed nickel(II) coordination polymers bearing a rigid bis-triazole linker

“…In all three complexes, the btb ligands show the anti-conformation and act as l 2 -bridging linkers bridging adjacent metal centers, but exhibit different rotameric conformations, leading to different non-bonding NiÁÁÁNi/CuÁÁÁCu distances and different dihedral angles (15.98°for 1, 26.51°for 2, 13.70°for 3) between the two triazole rings of these N-containing ligands. As shown in Table 3, complex 1 features a 2D layer, while 2 displays a 1D zigzag chain, and 3 has a rare 3D trinodal (3,4,4)-connected network with 3,4,4T20 topology, respectively. The different coordination architectures can be attributed to variations in the metal center and coordination mode of the carboxylate anions.…”

“…The design and assembly of metal-organic coordination polymers (MOCPs) are currently attracting much attention, not only because of their wide range of structures but also because of their potential applications in luminescence, adsorption, catalysis and magnetism [1][2][3][4]. Much effort has been spent on the rational design and controlled synthesis of MOCPs, but it is still a great challenge to predict the structures of metal-organic coordination compounds.…”

Syntheses and Characterization of Three Coordination Polymers of Zinc(II) and Cadmium(II) with Dicarboxylates and Bis(thiabendazole) Ligands

“…From a synthetic point of view, the judicious selection of appropriate organic ligands is proved to be one of the most effective ways to construct CPs. The flexible N-donor ligand such as bis(benzimidazole), has gained considerable attention in the construction of CPs and a number of aesthetic topological structures have been obtained [6][7][8]. However, the systematic investigation of the derivatives of benzimidazole, such as thiabendazole, still remains unsatisfactory.…”