Abstract
Abstract1,2‐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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