data that indicate that a rhodium ethylene complex, formally described as rhodium(I) and which forms a 2-rhoda(III) oxetane following reaction with H2O2, is more accurately described as a rhodium(III) metallacyclopropane. X-ray absorption spectroscopy clearly demonstrates a change in the oxidation state at rhodium following ligand coordination with tris(2-pyridylmethyl)amine. Both NMR and density functional
本文中,我们报告了实验,光谱和计算数据,这些数据表明,与H 2 O 2反应后,正式描述为
铑(I)并形成2-rhoda(III)氧杂
环丁烷的
铑乙烯配合物更准确地描述为
铑(III)
金属
环丙烷。X射线吸收光谱清楚地表明,在
配体与三(2-
吡啶基甲基)胺配位后,
铑的氧化态发生了变化。NMR和密度泛函理论研究均表明,对配位
乙烯的旋转具有很高的能垒,这归因于由于π背键的丧失而导致的较大的几何和电子
重组。这些结果表明,H 2 O 2的作用如前所述,2-rhoda(III)氧杂
环丁烷形成过程中的“氧化”是氧化C 2 H 4片段而不是
金属中心。