Two Novel Co(II)/Ni(II) Coordination Polymers Based on 3,5-( di(2',5'-dicarboxylphenyl)benozoic Acid Ligand: Crystal Structures, Magnetic Properties and Oxygen Evolution Reaction

Publication date: Available online 11 October 2018Source: Journal of Solid State ChemistryAuthor(s): Xiao-Kun Wang, Jun-Wu Tian, Dan-Dan Huang, Ya-Pan Wu, Li-Qing Pan, Dong-Sheng LiAbstractTwo new 2D coordination polymers (CPs), [Co2(HL)(4,4′-bipy)(H2O)]·0.5 (4,4′-bipy)·3H2O (1) and [Ni1.5(H2L)(4,4′-bipy)1.5(H2O)3]·2H2O (2), were prepared by hydrothermal reactions of Co(II)/Ni(II) salt with 3,5-(di(2',5'-dicarboxylphenyl)benozoic acid (H5L) and 4,4′-dipyridyl (4,4′-bipy). Compounds 1 and 2 were assembled to form a 3D framework by hydrogen bonds, 1 shows a binodal (3,6)-connected kgd net with a (43)2(46.66.83) topology, while 2 displays a new (3,4)-connected net topology with a Schläfli symbol of {4.62}2{42.62.82}. Magnetic susceptibility measurements indicate that both 1 and 2 show weak antiferromagnetic interactions between the adjacent Co(II) ions and Ni(II) ions. Moreover, electrocatalytic properties of two compounds for oxygen evolution reaction (OER) were also studied.Graphical abstractTwo new Co(II)/Ni(II) coordination polymers were prepared by multicarboxylate ligands and N-donor auxiliary ligands. Magnetic studies indicate that two compounds show weak antiferromagnetic interactions. Additionally, compound 1 exhibits better and stable OER performance with the overpotentials of 395 mV at 10 mA cm−2, a Tafel slope of 68 mV dec−1 and long-term stability of at least 12 h.
Source: Journal of Solid State Chemistry - Category: Chemistry Source Type: research