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A copper-based coordination polymer formed through synergistic bridging of 1,2,4-triazole and acetate anions: synthesis, crystal structure and magnetic properties

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Abstract

A Cu(II) coordination polymer, [Cu2(pztrz)2(μ-CH3COO)(CH3COO)]·3H2O (1), derived from mono-substituted 1,2,4-triazole derivative 3-(pyrazinyl)-1,2,4-triazole (Hpztrz) is isolated and structurally characterized. X-ray structural analysis shows that Hpztrz ligands and acetate anions demonstrate different coordination modes in complex 1. The two Cu(II) ions are bridged by the 1,2,4-triazole ring of Hpztrz to form a dinuclear unit, which is further linked by two bridging acetate anions to form a tetranuclear Cu4 unit. Interestingly, each Cu4 unit is connected to another four Cu4 units through the outer pyrazinyl of Hpztrz, resulting in a two-dimensional (2D) layer structure. Consecutive layers are further packed into three-dimensional (3D) structures through interlayer hydrogen-bonding interactions. Furthermore, variable-temperature magnetic susceptibility studies reveal that the antiferromagnetic interactions are mediated through 1,2,4-triazole-N1,N2 bridges and acetate bridges with coupling constants of J1 =  − 69.98 cm−1 and J2 =  − 2.15 cm−1.

Graphic abstract

Synergistic co-coordination of 1,2,4-triazole and acetate ions with Cu(II) ions led to a dinuclear unit, then to a Cu4 unit and finally to a 2D layer. Consecutive layers are further packed into a 3D framework through interlayer hydrogen-bonding interactions. Furthermore, variable-temperature magnetic susceptibility studies indicated the existence of antiferromagnetic coupling between the Cu(II) ions.

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Acknowledgements

This work was supported by the Foundation of Jiangsu Students’ Innovation and Entrepreneurship Training Program (No. 201910320016Z), the Natural Science Foundation of Xuzhou City (KC19050), Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) and PAPD of Jiangsu Higher Education Institution.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, People’s Republic of China

    Lu Di, Hao Dong, Dan Ni Chen, Hai Ying Wang & Hui Yan Liu

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  1. Lu Di
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  2. Hao Dong
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  3. Dan Ni Chen
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  4. Hai Ying Wang
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  5. Hui Yan Liu
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Correspondence to Hai Ying Wang or Hui Yan Liu.

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Di, L., Dong, H., Chen, D.N. et al. A copper-based coordination polymer formed through synergistic bridging of 1,2,4-triazole and acetate anions: synthesis, crystal structure and magnetic properties. Transit Met Chem 46, 57–63 (2021). https://doi.org/10.1007/s11243-020-00421-9

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  • DOI: https://doi.org/10.1007/s11243-020-00421-9

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