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Synthesis, structures and properties of copper(II) and zinc(II) complexes with 1,2-bis(benzimidazol-2-yl)ethane ligands

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Abstract

1,2-Bis(benzimidazol-2-yl)ethane (bbe) and its transition metal complexes, [Cu(bbe)Cl2]·DMF (1) and [Zn(bbe)Cl2]2(2), have been synthesized and characterized by elemental analysis, UV–Vis and IR spectra. X-ray crystal structure analysis revealed that both complexes have four-coordinate, distorted tetrahedral geometries. Complex 2 has two crystallographically independent but chemically identical Zn(bbe)Cl2 units. The cyclic voltammogram of complex 1 shows an irreversible Cu2+/Cu+ couple. In vitro antioxidant tests showed that complex 1 has significant antioxidant activity against superoxide. Photoluminescence investigations showed that complex 2 exhibits light blue (441 nm) photoluminescence. Compared with the free bbe proligand, a redshift of 16 nm was observed for complex 2, which may be attributed to π*–π transitions.

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Acknowledgements

The present research was supported by the Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University (Grant Number 152022) and the Natural Science Foundation of Gansu Province (Grant Number 17JR5RA090).

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Authors and Affiliations

  1. School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu, People’s Republic of China

    Kun Zhao, Yao Qu, Yancong Wu, Cong Wang, Kesheng Shen, Chuang Li & Huilu Wu

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  1. Kun Zhao
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  2. Yao Qu
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  3. Yancong Wu
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  4. Cong Wang
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  7. Huilu Wu
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Correspondence to Huilu Wu.

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Zhao, K., Qu, Y., Wu, Y. et al. Synthesis, structures and properties of copper(II) and zinc(II) complexes with 1,2-bis(benzimidazol-2-yl)ethane ligands. Transit Met Chem 44, 713–720 (2019). https://doi.org/10.1007/s11243-019-00340-4

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