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Metal-to-Ligand Ratio Controlled Assembly of Two Ni(II) Complexes: Structures, Luminescent and Electrochemical Properties

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Abstract

Treatment of Ni(OAc)2·4 H2O with 3,4-pyrazoledicarboxylic acid (H3pdc) and imidazole (ImH) in different metal-to-ligand ratios afforded two dinuclear nickel(II) complexes, [Ni(Hpdc)(ImH)(H2O)2]2·4 H2O (1) and [Ni(Hpdc)(ImH)2(H2O)]2·2.5 H2O (2), which were characterized by elemental analysis (EA), IR spectra and X-ray diffraction analysis and thermogravimetric analysis (TGA). Both in 1 and 2, the dinickle unit [Ni2(µ2-Hdpc)2] with six-numbered Ni2N4 ring was formed by a pair of µ2-Hpdc2− ligands linked two Ni(II) ions in N,O-chelating and N‒N-bridging fashions. The dinuclear units in 1 and 2 were expanded to 2D layer structures though hydrogen-bonding interactions between coordination water molecules, ImH molecules and carboxylate oxygen atoms, whereas the lattice water molecules in 1 and 2 just embedded in the 2D layer through intermolecular hydrogen bonding interactions. Finally, the 2D sheets in 1 were further assembled to a 3D supramolecular architecture via intermolecular C–H⋯O hydrogen bond. Besides, the luminescent and electrochemical properties of two complexes have been reported.

Graphic Abstract

Two dinuclear nickel(II) complexes, [Ni(Hpdc)(ImH)(H2O)2]2·4 H2O (1) and [Ni(Hpdc)(ImH)2(H2O)]2·2.5 H2O (2), were obtained by assembling of a Ni(II) ion, 3,4-pyrazoledicarboxylic acid (H3pdc) and imidazole (ImH) in different metal-to-ligand ratios. In 1 and 2, the O(C, N)−H⋯O hydrogen bonds expanded the dinuclear complexes to 3D/2D supramolecular structures, respectively.

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Acknowledgements

The project was supported by the National Natural Science Foundation of China (No. 21101018), Priority Academic Program Development of Jiangsu Higher Education Institutions (No. 13KJB150001), and the Natural Science Foundation of State Key Laboratory of Coordination Chemistry of Nanjing University.

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Authors and Affiliations

  1. School of Petrochemical Engineering, and Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, Jiangsu, People’s Republic of China

    Mei-Ling Cheng, Lu Liu, Lin Sun, Feng Tao, Meng-Na Qin, Qi Liu & Xiao-Yan Tang

  2. School of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu, 215500, Jiangsu, China

    Xiao-Yan Tang

  3. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, China

    Qi Liu

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  1. Mei-Ling Cheng
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  2. Lu Liu
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  3. Lin Sun
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  4. Feng Tao
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  5. Meng-Na Qin
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Correspondence to Mei-Ling Cheng or Qi Liu.

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Cheng, ML., Liu, L., Sun, L. et al. Metal-to-Ligand Ratio Controlled Assembly of Two Ni(II) Complexes: Structures, Luminescent and Electrochemical Properties. J Chem Crystallogr 51, 265–272 (2021). https://doi.org/10.1007/s10870-020-00854-1

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  • DOI: https://doi.org/10.1007/s10870-020-00854-1

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