Effect of Chelate Ring Size of Binuclear Copper(II) Complexes on Catecholase Activity and DNA Cleavage
作者:Alana M. Homrich、Giliandro Farias、Suélen M. Amorim、Fernando R. Xavier、Rogério A. Gariani、Ademir Neves、Hernán Terenzi、Rosely A. Peralta
DOI:10.1002/ejic.202001170
日期:2021.5.14
Catecholase activity of dicopper(II) complexes containing different numbers of chelate members in the pyridine groups of the ligand was studied to identify a functional model for copper enzyme catechol oxidase. Complexes [CuII(μ‐OH)CuII(L1)](ClO4) (1), [CuII(μ‐OH)CuII(L2)](ClO4) (2), and [CuII(μ‐OH)CuII(L3)](ClO4) (3) were synthesized and characterized by elemental analysis, FTIR, UV–Vis spectroscopy
研究了在配体的吡啶基团中包含不同数量螯合成员的双铜(II)配合物的儿茶酚酶活性,以鉴定铜酶儿茶酚氧化酶的功能模型。配合物[Cu II(μ‐OH)Cu II(L 1)](ClO 4)(1),[Cu II(μ‐OH)Cu II(L 2)](ClO 4)(2)和[Cu II(μ‐OH)Cu II(L 3)](ClO 4)(3通过元素分析,FTIR,UV-Vis光谱,质谱和电化学进行合成和表征。确定了它们在3,5-二叔丁基邻苯二酚氧化中的催化活性。改变螯合环的成员数改变了催化活性。络合物2由于具有高周转率而显示出最高的催化活性,效率为3.40±0.61。机理研究表明,催化反应是通过将Cu(II)还原为Cu(I)并形成过氧化氢而发生的。通过DFT和TD-DFT计算可以进一步合理化光谱和儿茶酚酶活性。有趣的是,所有三种复合物还显示出DNA结合特性,这也通过分子对接研究得到了证实。