Synthesis,structure, and antioxidative properties of a copper(II) complex with 1,2-bis(benzimidazol-2-yl)ethane ligand |
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Authors: | Xia Tang Yao Qu Cong Wang Yancong Wu Kun Zhao Huilu Wu |
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Institution: | School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, People's Republic of China |
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Abstract: | 1,2-Bis(benzimidazol-2-yl)ethane (bbe) and its copper(II) complex, {Cu(bbe)Br2]2}·2DMF ( 1 ), have been synthesized and characterized by elemental analysis, ultraviolet–visible, and infrared spectra. The single crystal structure analysis of 1 shows two crystallographically independent but chemically identical Cu(bbe)Br2] molecules. The coordination geometry of the copper atoms may best be described as a distorted tetrahedron (τ4 = 0.740 for Cu1 and 0.696 for Cu2). The cyclic voltammogram of complex 1 represents quasi-reversible Cu2+/Cu+ pairs. in vitro antioxidant tests showed that complex 1 has significant antioxidant activity against superoxide and hydroxy radicals. Photoluminescence investigations showed that the fluorescence intensity of complex 1 is significantly weaker than that of the ligand. This may be due to the paramagnetic effect of divalent copper to cause quenching of fluorescence. |
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Keywords: | 1 2-bis(benzimidazol-2-yl)ethane antioxidant activity copper(II) complex crystal structure electrochemistry photophysical property |
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