Synthesis, structure, and antioxidative properties of a copper(II) complex with 1, 2‐bis(benzimidazol‐2‐yl)ethane ligand. Issue 4 (29th July 2019)

• Record Type: Journal Article
• Authors: Tang, Xia; Qu, Yao; Wang, Cong; Wu, Yancong; Zhao, Kun; Wu, Huilu
• Is Part Of: Journal of the Chinese Chemical Society. Volume 67:Issue 4(2020)
• Page Start: 585
• Page End: 591
• Publication Date: 2019-07-29
• Subjects: 1, 2‐bis(benzimidazol‐2‐yl)ethane -- antioxidant activity -- copper(II) complex -- crystal structure -- electrochemistry -- photophysical property; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.201900189
• Languages: English
• ISSNs: 0009-4536

Abstract

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 ( τ 4 = 0.740 for Cu1 and 0.696 for Cu2). The cyclic voltammogram of complex 1 represents quasi‐reversible Cu 2+ /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. Abstract : A new four‐coordinated copper(II) complex with 1, 2‐bis(benzimidazol‐2‐yl)ethane has been synthesized and characterized. Cyclic voltammograms of the complex indicate a quasi‐reversible Cu 2+ /Cu + couple. A solid fluorescence peak of complex 1 may be attributed to ligand‐centered luminescence. Complex 1 exhibited excellent antioxidant activities against OH . and O2 −. radicals in vitro.