Construction of Four Zn(II) Coordination Polymers Used as Catalysts for the Photodegradation of Organic Dyes in Water

Abstract

Abstract:Hydrothermal reactions of Zn(OAc) 2¨2 H 2 O with flexible bipyridyl benzene ligand and three dicarboxylic derivatives gave rise to four new coordination polymers, [Zn 7 (µ 4 -O) 2 (OAc) 10 (bpmb)] n (1), [Zn(5-OH-1,3-BDC)(bpmb)] n (2), [Zn(1,2-BDC)(bpmb)] n (3) and [Zn 2 (ADB) 2 (bpmb)] n (4) (bpmb = 1,4-bis(pyridine-3-ylmethoxy)benzene, 5-OH-1,3-H 2 BDC = 5-hydroxy-1,3-benzenedicarboxylic acid, 1,2-H 2 BDC = 1,2-benzenedicarboxylic acid, H 2 ADB = 2,2'-azodibenzoic acid). Their structures were characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). Compound 1 features a one-dimensional (1D) chain structure based on the rare heptanuclear [Zn 7 (µ 4 -O)(µ 3 -OAc) 2 (µ 2 -OAc) 8 ] units. Compound 2 exhibits a novel 2D bilayer structure built from the two parallel 2D (4,4) layers. Compound 3 holds a 2D structure in which the 1,2-BDC ligands work as lockers interlocking 1D [Zn(bpmb)] n chain. Compound 4 comprises a 3D framework constructed by 2D wrinkled [Zn 2 (ADB) 4 ] n networks and bpmb linkers with a six-connected pcu net. These results suggest that the motifs of the dicarboxylic ligands have significant effect on the final structures. These compounds exhibited relatively good photocatalytic activity towards the degradation of methylene blue (MB) in aqueous solution under a Xe lamp irradiation.

Structural diversity induced by ligand geometry: From two-dimensional to three-dimensional coordination polymers with pyridine

“…In the three structures, py can show different coordination abilities because of the change of the geometry of the ligands. There are more obvious differences in the characteristics of the three structures on increasing the number of coordinated the zinc ions (4, 5, 6) and the connected number of carboxylates (1,2,3), while the number of py groups (0, 1, 2) coordinated with zinc ions decreases. Compound 1 has a high porosity (33.6%) due to the solvent molecules NMP occupying pores.…”

Functionalization of Molecularly Imprinted Polymer Microspheres for the Highly Selective Removal of Contaminants from Aqueous Solutions and the Analysis of Food-Grade Fish Samples

“…Increasing worldwide concern regarding environmental pollution has inspired researchers to explore high-performance functional materials to remediate the contaminated global environment, especially aquatic systems that have a key impact on human life and food supply [1,2,3,4,5,6,7,8,9,10,11,12]. Various kinds of functional materials have thus been reported for achieving environmental remediation [3,4,13,14,15,16,17,18,19,20,21]. Generally, they rely on processes such as photocatalytic degradation, chemical oxidation, membrane separation, chemical precipitation, biological treatment, and adsorption [6,13,14,15,16,17,18,22].…”

“…Various kinds of functional materials have thus been reported for achieving environmental remediation [3,4,13,14,15,16,17,18,19,20,21]. Generally, they rely on processes such as photocatalytic degradation, chemical oxidation, membrane separation, chemical precipitation, biological treatment, and adsorption [6,13,14,15,16,17,18,22]. Among these methods relying on functional materials, adsorption processing has been regarded as one of the most viable techniques due to its inherent advantages that include facile operation, low cost, high efficiency, and freedom from the generation of secondary pollutants [23].…”

A Ca(II) Coordination Polymer of 2-Carboxybenzaldehyde: Synthesis, Crystal Structure, and Catalytic Activity in Oxidation of Benzyl Alcohol

“…Metal coordination polymers have attracted much attention in recent years, which is due to their novel structures and potential applications in luminescence, catalysis, magnetism, gas storage, and biological activity [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Among them, the coordination polymers were mainly composed by transition metal ions and rare earth metal ions with organic ligands [15][16][17][18].…”