Synthesis, characterization, and crystal structures of 2D cobalt(II) and nickel(II) coordination polymers containing flexible bis(benzimidazole) ligands

Synthesis and Structural Characterization of Two-Dimensional Metal-Organic Framework by Using Bent Ditopic Carboxylate Ligands

“…The Zn(II) center is ve-coordinated by four oxygen atoms from four cba 2− ligands and one nitrogen atom from one bpdb ligand, giving a geometry with distorted trigonal bipyramidal structure. The Zn-O and Zn-N bond lengths and O-Zn-O and O-Zn-N bond angles are from 2.032(3) to 2.051(3) Å and 87.74 (12) to 163.68(11) °, respectively, within the region of values observed for similar Zn(II) complexes with ve coordination number and oxygen and nitrogen donor ligands [20][21][22]. In the crystal structure of 2DTMU-1, the cba 2− ligands bridge the same mode to link four Zn(II) centers, whereas the bpdb acts as a trans-bidentate bridging ligand to link pairs of Zn atoms.…”

“…In a second group, 1D metal-carboxylate chains can be constructed by the coordination of bent ditopic carboxylate linkers. In some cases, like 4,4'-methylenedibenzoic acid (H2cba), mentioned 1D chains can be connected together through N-donor pillars and forms 2D frameworks [12], while in cases like 4,4'oxybis(benzoic acid) with helix like 1D metal-carboxylate linkers [13] the 1D chains can be connected together by N-donor pillar to form 3D frameworks [14]. So based on this criteria, in this work, we have synthesized a Zn(II) metal-organic framework, [Zn(cba)(bpdb)].DMF (2DTMU-1), based on a V-shaped exible dicarboxylate ligand, 4,4'-methylenedibenzoic acid (H2cba), and the N-donor ligand, 1,4-bis(4pyridyl)-2,3-diaza-1,3-butadiene (bpdb), and the effect of the-CH 2 -group of the H2cba was compared with similar reported pillared MOFs, TMU-4 and TMU-5.…”

Urea Decomposition Mechanism by Dinuclear Nickel Complexes

“…Beyond precipitation, an increase in conductivity from 40 μS cm −1 to 132 μS cm −1 was observed upon water titration, indicating the apparent formation of complexes 1e or 1g. Solid IR analysis of the soluble fraction (SI8) presented bands at 1698 cm −1 and 1477 cm −1 that could be from a protonated carboxylate [ 26 ] or from monodentate ν a COO − and ν s COO − ( Figure 4 , complex 1d) [ 27 ]. However, titration with deuterated water revealed the same spectra as H 2 O titration (SI8), indicating the soluble complex is most likely from a monodentate acetate (complex 1a).…”

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…The introduction of a free amine group demonstrated its ability to undergo intramolecular hydrogen bonding with bound anionic species due to which these are unapproachable to guest molecules. Apart from the aforesaid rhombic grid based 2D MOFs, several other examples are also reported. ,,,− …”