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Synthesis, structures and magnetic properties of three copper(II) complexes of 2-(1H-pyrazol-3-yl) pyridine

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Abstract

Three Cu(II) complexes: [Cu2(μ-L)2(HCOO)2(H2O)2] (1), [Cu2(μ-L)2(NO3)2] (2), and [Cu4(μ-L)6(CH3COO)2]·2H2O (3) constructed from 2-(1H-pyrazol-3-yl) pyridine (HL) were synthesized and structurally characterized by X-ray single-crystal diffraction. The X-ray analyses revealed that all three complexes feature a di-ligand-bridged Cu2 unit, which is nearly planar. Each deprotonated ligand chelates one copper atom by means of N,N(pyridine-pyrazole) pocket and simultaneously bridges the other one by the N,N(pyrazole) groups. The remaining coordination sites of the Cu(II) centers are either occupied by different anionic coligands to balance the charge, or bridged by another L to develop a tetranuclear structure. Magnetic investigations reveal that the distortion of the Cu(II) coordination geometry (as described by the τ values) and the coplanarity of the Cu–(N=N)2–Cu unit have cooperative effects on the antiferromagnetic strength of these systems.

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Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (NSFC, 21571087, 21401085, 21401086, and 21401099), Top-notch Academic program Project (TAPP) and PAPD of Jiangsu Higher Education Institutions, Undergraduate Training Program for Innovation and Entrepreneurship of Jiangsu Normal University Kewen College (2017kw015).

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Authors and Affiliations

  1. School of Chemistry and Material Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, 221116, Jiangsu, People’s Republic of China

    Feng-Lei Yang, Bei-Bei Liang, Jing-Hang Zhang, Wen-Hao Wu, Shuang-Quan Zheng, Yu-Ying Mao, Jun-Qian Chen, Jia-Xin Cao & Guang-Zhou Zhu

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  1. Feng-Lei Yang
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Correspondence to Feng-Lei Yang or Guang-Zhou Zhu.

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Yang, FL., Liang, BB., Zhang, JH. et al. Synthesis, structures and magnetic properties of three copper(II) complexes of 2-(1H-pyrazol-3-yl) pyridine. Transit Met Chem 43, 211–220 (2018). https://doi.org/10.1007/s11243-018-0202-z

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