Syntheses, Structures, Electrochemistry, and Electrocatalysis of Three Copper(II) Coordination Polymers constructed from 5-[4-(1H-Imidazol-1-yl)phenyl]-1H-tetrazole

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• 作者：Ming Song ; Bao Mu and Ru-Dan Huang
• 刊名：Zeitschrift für anorganische und allgemeine Chemie
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：643
• 期：3
• 页码：235-242
• 全文大小：2866K
• ISSN：1521-3749

文摘

Three coordination polymers (CPs) based on the 5-[4-(1H-imidazol-1-yl)phenyl]-1H-tetrazole (HL) ligand, namely, [Cu(μ₂-L)(μ₄-pbda)(H₂O)] (1), [Cu₂(μ-Hbtc)(H₂btc)(μ₃-OH)(μ₄-HL)] (2) and [Cu₅(μ₃-L)(μ₄-L)(μ₃-ip)(μ₃-OH)(H₂O)₂]·2H₂O (3) (H₂pbda = 1,4-benzenedicarboxylic acid, H₃btc = 1,3,5-benzenetricarboxylic acid, H₂ip = isophthalic acid) were hydrothermally synthesized and structurally characterized. Complex 1 represents “weave”-type 2D layers consisting of wave-like 1D chains and 1D straight chains, which are further connected by hydrogen bonds to form a 3D supramolecular structure. Complex 2 exhibits a uninodal (4)-connected 2D layer with a point symbol of {4⁴·6²}, in which the L ligand can be described as μ₅-bridging and the H₂btc^– ions display multiple kinds of coordination modes to connect Cu^II ions into 1D “H”-type Cu-H₂btc chains. In complex 3, 2D Cu-L layers with two kinds of grids and 1D “stair”-type Cu-ip chains link each other to construct a 3D {4¹²·6³} framework, which contains the pentanuclear subunits. Deprotonated degree and coordination modes of carboxylate ligands may consequentially influence the coordination patterns of main ligands and the final structures of complexes 1–3. Furthermore, electrochemical behaviors and electrocatalytic activities of the title complexes were analyzed at room temperature, suggesting practical applications in areas of electrocatalytic reduction toward nitrite and hydrogen dioxide in aqueous solutions, respectively.