the detection and characterization of the Ni(III) intermediates generated by reaction of (1,4,8,11-tetraazacyclotetradecane)nickel(II) perchlorate with KHSO5. Four Ni(III) intermediates can be trapped or detected through variation in Cl- or KHSO5 concentrations. Upon oxidation of [Ni(cyclam)]2+ by 2.5 equiv of KHSO5, deprotonation of the cyclam ligand generates two red Ni(III) species with lambda max
我们报告了由(
1,4,8,11-四氮杂环十四烷)
高氯酸镍(II)与KHSO5反应生成的Ni(III)中间体的检测和表征。可以通过改变Cl-或KHSO5的浓度来捕获或检测四种Ni(III)中间体。当[Ni(cyclam)] 2+被2.5当量的KHSO5氧化时,cyclam
配体的去质子化反应生成两个红色的Ni(III)物种,λmax = 530 nm,g垂直= 2.20,g平行= 2.02或g垂直=轴向四坐标或六坐标二
氯化物物种分别为2.16和g parallel = 2.01。这些形式通过复杂的
配体氧化机理分解为Ni(II)产物。可以对Ni(III)二
氯化物进行质子化,然后通过外球相互作用与DNA结合,这可以通过CD信号在400 nm附近的反转符号来证明。累积的结果表明,在过量的
氯化物条件下,Ni(III)中心是配位饱和的,但仍然能够与DNA底物相互作用。这表明通过[Ni(cyclam)]