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Crystal structures, magnetic, dielectric and ferroelectric properties of two copper(II) complexes with m-nitrobenzoic acid

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Abstract

Reactions of CuCl2, m-nitrobenzoic acid (HNBA) and NaOH with 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen) in aqueous ethanol afforded two Cu(II) complexes Cu(bpy)(NBA)2, 1, and [Cu(phen)(H2O)2(NBA)](NBA), 2. The monomolecular Cu(bpy)(NBA)2 moieties are both bridged by hydrogen bonding interactions and interlayer π *–π *stacking interactions to form a 3D (3,4,6)-connected supramolecular architecture with the Schäfli symbol of (44·62)(44·66·85)(63)2. Complex 2 crystallizes in a noncentrosymmetric space group P21 where all molecules show the same orientation along the polar b axis. Preliminary investigations suggest that 2 exhibits ferroelectric hysteresis loops at room temperature with remanent polarization (P r) of ca. 0.09 μC cm−2 and coercive electric fields of 2.53 kV cm−1, respectively. It may be a potential ferroelectric with a relatively large spontaneous polarization (P s) of 0.22 μC cm−2. Furthermore, permittivity property measurements reveal a dielectric constant (ε r) of 6.36. Variable-temperature (2–300 K) magnetic susceptibility measurements showed the presence of weak ferromagnetic interactions between the Cu(II) ions for both 1 and 2.

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Acknowledgments

This project was supported by Education Department of Zhejiang Province and the K. C. Wong Magna Fund in Ningbo University.

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Authors and Affiliations

  1. Center of Applied Solid State Chemistry Research, Ningbo University, Ningbo, 315211, People’s Republic of China

    Xiao-Ke Yu, Cun-Jie Lin, Yue-Qing Zheng & Hong-Lin Zhu

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  1. Xiao-Ke Yu
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  2. Cun-Jie Lin
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  3. Yue-Qing Zheng
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Correspondence to Yue-Qing Zheng.

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Yu, XK., Lin, CJ., Zheng, YQ. et al. Crystal structures, magnetic, dielectric and ferroelectric properties of two copper(II) complexes with m-nitrobenzoic acid. Transition Met Chem 39, 71–79 (2014). https://doi.org/10.1007/s11243-013-9776-7

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  • DOI: https://doi.org/10.1007/s11243-013-9776-7

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