MOFs constructed with the newly designed imidazole dicarboxylate bearing a 2-position aromatic substituent: hydro(solvo)thermal syntheses, crystal structures and properties

Abstract

Six metal-organic frameworks, namely, [Cd(μ(2)-HDMPhIDC)(Py)](n) (H(3)DMPhIDC = 2-(3,4-dimethylphenyl)-1H-imidazole-4,5-dicarboxylic acid, Py = pyridine) (1), [Sr(μ(2)-HDMPhIDC)(H(2)O)](n) (2), {[M1(3)(μ(3)-DMPhIDC)(2)(H(2)O)(6)]·2H(2)O}(n) (M1 = Zn (3), or Mn (4)), [M2(μ(2)-HDMPhIDC)(H(2)O)(2)](n) (M2 = Mg (5), or Ca (6)), have been hydro(solvo)thermally synthesized and structurally characterized by single-crystal X-ray diffraction, elemental analyses, X-ray powder diffraction (XRPD), thermal analyses and IR spectra. 1 is a meso-compound and displays a 3D non-interpenetrated framework with 1D open channels and [Cd(2)(HDMPhIDC)(3)(Py)(2)](4) cages, which are composed of left- and right-handed helices pillared by Cd(2+) linkages. Polymer 2 exhibits a sheet structure containing infinite distorted hexagonal rings assembled from adjacent corrugated-shaped polymeric chains. Polymers 3 and 4 are isomorphous with an interesting 3D network containing infinite 1D-hexagonal channels and [M2(2)(DMPhIDC)](6) cages, which have two interpenetrating net topologies. Both polymers 5 and 6 present interesting two-dimensional architectures. In these MOFs, the imidazole dicarboxylate ligand shows the diversity in its coordination modes and strong coordination ability. There exists antiferromagnetic coupling between the Mn(II) ions in 4. Furthermore, the solid-state luminescent properties for polymers 1-3, 5 and 6 have also been discussed in detail.

Construction and Properties of Two MOFs Based on 2‐p‐Bromophenyl Imidazole Dicarboxylate

“…The bond angles around the Mn 2+ ion are in the range of 75.54(6) to 180.00(6)°. All the bond lengths and angles in the p ‐BrPhH 2 IDC – are consistent with those reported in the literature 13,14…”

Selective pyridine recognition by an imidazole dicarboxylate-based 3D cadmium(ii) MOF

“…‡ The coordination features of the p-ClPhH 3 IDC ligand have been investigated by theoretical (ESI, Scheme S1 †) and experimental methods. 20,21 More important, polymer 1 not only shows an elaborate crystallographic structure, but also indicates interesting selective recognition for pyridine.…”

Anion-dependent assemblies of a series of Cd(ii) coordination complexes based on an asymmetric multi-dentate ligand and inorganic SBUs: syntheses, crystal structures, and fluorescent properties

“…And bond angels around the central CdIJII) ion vary from 78.791(0) to 168.987IJ0)°, which are in agreement with other complexes containing CdIJII). [33][34][35][36][37] The {CdIJ1)OClN 4 } octahedron and {CdIJ2)OClN 4 } octahedron share two N atoms (N11 and N14) from two N 3 − anions to form a binuclear unit containing an inorganic SBU ijCdCl(CH 3 OH)IJN 3 )] 2 , in which the Cd⋯Cd distance is 3.6381IJ0) Å. The adjacent inorganic SBUs are bridged by double bpmi ligands via head-to-tail interactions to form a 1D straight chain along the a axis.…”