Characterization and catechole oxidase activity of a family of copper complexes coordinated by tripodal pyrazole-based ligands
作者:R. Marion、M. Zaarour、N.A. Qachachi、N.M. Saleh、F. Justaud、D. Floner、O. Lavastre、F. Geneste
DOI:10.1016/j.jinorgbio.2011.07.020
日期:2011.11
of the complexes was studied. The reaction rate depends on two factors. First, the presence of an oxygen atom in the third position of the side chain should be avoided to keep the effectiveness of the reaction. Second, the electronic and steric effects of substituents on the pyrazole ring strongly affect the catalytic activity of the complex. Thus, best results were obtained with complexes containing
通过1-羟基吡唑与氨基醇之间的缩合反应合成了基于三脚架吡唑的配体家族。在吡唑环的取代基和侧链上都引入了多样性。通过与CuCl 2反应制备了相应的铜(II)配合物在四氢呋喃中。它们已通过EPR,UV光谱和循环伏安法进行了表征。EPR中没有半场分裂信号,这表明该复合物以单核形式存在于溶液中。研究了三脚架配体的取代基和侧链对配合物儿茶酚酶活性的影响。反应速率取决于两个因素。首先,应避免在侧链第三位置存在氧原子,以保持反应的有效性。第二,吡唑环上取代基的电子和空间效应强烈影响配合物的催化活性。因此,使用含有未取代的吡唑基配体的配合物可获得最佳结果。