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Two CoII Metal–Organic Frameworks Based on a Multicarboxylate Ligand as Electrocatalysts for Water Splitting

Authors

  • Prof. Yun Gong,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Zhi Hao,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Dr. Jiangping Meng,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Huifang Shi,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Penggang Jiang,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Miaomiao Zhang,

    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
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  • Prof. Jianhua Lin

    Corresponding author
    1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)
    • Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (P. R. China)

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Abstract

By using a rigid multicarboxylate ligand, 4,5-di(4′-carboxylphenyl)phthalic acid (H4L), two CoII complexes formulated as [Co4L2(4,4′-bpy)(H2O)6]3.5 H2O (4,4′-bpy=4,4′-bipyridine) (1) and [Co2L(azene)(H2O)3]DMF (azene=(E)-1,2-di(pyridin-4-yl)diazene, DMF=dimethylformamide) (2) have been synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 features a novel three-nodal (4,5,6)-connected 2 D framework with an unusual (32.42.5.63.7.8)(32.42.5.6)(32.46.52.64.7) topology. Complex 2 exhibits a novel two-nodal (4,7)-connected 3 D framework with an unusual (43.5.62)(45.55.69.7.8) topology. Ligand L4− displays different coordination modes in the two complexes. The complexes both exhibit electrocatalytic activities toward generating H2 and O2 from water with lowered overpotentials and enhanced currents. The different electrocatalytic properties of the two complexes are related to their different ligands and frameworks.

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