Two metal–organic frameworks with unique high-connected binodal network topologies: synthesis, structures, and catalytic properties

Abstract

{[Cd 3 (btec)(btx) 0.5 (m 3 -OH)(H 2 O)]?H 2 O} n (1) and [Cu 2 (btec)(btx) 1.5 ] n (2), two novel cadmium(II) and copper(II)-based high-connected metal-organic frameworks, with both 1,2,4,5benzenetetracarboxylate (btec) and 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene (btx) as mixed ligands were hydrothermally synthesized and structurally characterized. Both MOFs have three-dimensional (3D) structures, but different framework topologies and ligand linkage modes. 1 possesses an unprecedented binodal (4,12)-connected topology structure, in which the ligand btec serves as a rare dodecadentate and ordinary octadentate in two types of coordination modes. Meanwhile, 2 exhibits a binodal (4,7)-connected topological network with an enneadentate coordination geometry of the btec ligand. Both MOFs provide novel examples of designing and synthesizing novel binodal MOFs, and demonstrate that the 1,2,4,5-benzenetetracarboxylic acid ligand with rich coordination chemistry information is useful in the construction of binodal highly-connected nets. In addition, the catalytic performance of 2 has also been checked. 2 is active as a catalyst for the degradation of methyl orange. Experimental section Materials and general methodsAll the solvents and reagents for synthesis were commercially available and used as received. The ligand btx was synthesized according to a literature method. 8 Elemental analysis of C, H, and N were performed on a Perkin-Elmer 240C analyzer. IR spectra were measured on an FT-IR AVATAR 360 (Nicolet) spectrophotometer with KBr pellets. Powder X-ray diffraction

Using the Singly Deprotonated Triethanolamine to Prepare Dinuclear Lanthanide(III) Complexes: Synthesis, Structural Characterization and Magnetic Studies

“…The measured pXRD patterns of 2, 3 and 4 are very similar indicating that the complexes are isostructural. The differences in intensity may be due to the preferred orientation of the crystalline powder samples [44,45]. The experimental patterns agree satisfactorily with those calculated from the single-crystal X-ray diffraction data.…”

Influence of Flexible Bis(benzimidazole) Derivatives on the Self‐assembly of Three Mixed Ligands Silver(I) Coordination Polymers

“…At given time intervals, 3.0 mL of the reaction solution was taken out and centrifuged to remove the residual catalyst, then measured by using UV/Vis 1901 spectrophotometer. The degradation efficiency of methyl orange was evaluated based on the following formula: [24] Degradation efficiency = X-ray Crystallography: Diffraction date for complexes 1-3 were collected with a Bruker CCD area detector diffractometer with graphite monochromatized Mo-K α radiation (λ = 0.71073 Å) using ω scan mode at 293(2) K. The absorption correction was applied by using the SADABS program. [25] The structures were solved by direct methods applying the SHELXL-97 program [26] and refined through full-matrix least-squares on F 2 using SHELXL-97.…”

Crystal structure of trans-dichloridotetrakis(thiourea-κS)manganese(II), C4H16Cl2MnN8S4

“…[3][4][5][6]. As at ypical organometallic compound, organometallic polymers in which the organic group and magnetic metal centers are connected through carbon chemical bond has aroused special attentions for its abundant physical properties and wide industrial applications [7][8][9][10][11][12][13].…”