摘要: The novel dinuclear copper complex [Cu₂(H₂O)₂(DMF)₂(L)₂] (1, H₂L=5-phenyl-2H-1,2,3-triazole-4-carboxylic acid, DMF=N,N-dimethyl-formamide) has been synthesized and characterized by X-ray single-crystal diffraction. The compound crystallizes in triclinic system, space group P1 with a=9.591, b=10.508, c=15.515 Å, β=75.11°, V=1446.2 ų, Z=2, M_r=683.62, D_c=1.570 g/cm³, μ=1.531 mm^-1, F(000)=700, the final R=0.0404 and wR=0.1130 for 5327 observed reflections with I>2σ(I). In each unit of the complex, two Cu²⁺ ions coordinated with two triazole ligands to form a dimeric [5,6,5] tricyclic structure. The central Cu atom is five-coordinated, and each copper atom shows a square pyramidal geometry. The crystal structure is stabilized by the inversion-related O-H···O hydrogen bond and C-H···O hydrogen bonding interactions to form a layer structure. Fluorescent spectra show an obvious quenching of fluorescence compared with free 1,2,3-triazole ligand. The results of agarose gel electrophoresis indicate that this complex can cleave the plasmid supercoiled DNA within shorter time in the 50-folds excess of ascorbate under physiological conditions, providing a new example in the research for artificial metal nucleic acid enzyme.