Abstract
Hydrothermal reactions of Zn(OAc)2·2H2O with flexible bipyridyl benzene ligand and three dicarboxylic derivatives gave rise to four new coordination polymers, [Zn7(μ4-O)2(OAc)10(bpmb)]n (1), [Zn(5-OH-1,3-BDC)(bpmb)]n (2), [Zn(1,2-BDC)(bpmb)]n (3) and [Zn2(ADB)2(bpmb)]n (4) (bpmb = 1,4-bis(pyridine-3-ylmethoxy)benzene, 5-OH-1,3-H2BDC = 5-hydroxy-1,3-benzenedicarboxylic acid, 1,2-H2BDC = 1,2-benzenedicarboxylic acid, H2ADB = 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 [Zn7(μ4-O)(μ3-OAc)2(μ2-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 [Zn2(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.
Highlights
In recent years, increasing attention on functional coordination polymers (CPs) has led to the fast development of this type of solid material, which are due to their intriguing aesthetic structures and topological features, as well as their potential applications in catalysis, adsorption, separation and so on [1,2,3,4,5,6,7,8,9,10,11,12]
Photocatalysis is a green technology for the treatment of all kinds of contaminants that has many advantages over other treatment methods; for instance, the use of the environmentally friendly oxidant (O2 or H2 O2 ), the ambient temperature reaction condition, and oxidation of the organic
The photocatalytic activities of as-prepared samples were evaluated by the degradation of methylene blue (MB)
Summary
In recent years, increasing attention on functional coordination polymers (CPs) has led to the fast development of this type of solid material, which are due to their intriguing aesthetic structures and topological features, as well as their potential applications in catalysis, adsorption, separation and so on [1,2,3,4,5,6,7,8,9,10,11,12]. 1,2-bis(pyridine-4-ylmethoxy)benzene have been employed to construct varied functional CPs [17,18,19] Such flexible ligands could adopt various conformations and make changeable CPs [20,21]. [Zn2 (ADB) (bpmb)]n (4), were successfully synthesized by the starting materials flexible bipyridyl ligand 1,4-bis(pyridine-3-ylmethoxy)benzene (bpmb) and Zn(OAc)2 ̈ 2H2 O together with different rigid/flexible dicarboxylic auxiliary ligands 5-OH-1,3-H2 BDC, 1,2-H2 BDC and H2 ADB under solvothermal conditions. These four CPs were found to be able to photocatalytically degrade methylene blue (MB) in water in a relatively efficient way
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