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Radical cations of phenyl silatrane

机译:苯基硅丙烷的自由基阳离子

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摘要

Electrochemical oxidation of phenylsilatrane (1) in CH3CN/0.1 M Bu4NPF6 has been studied by voltammetry, UV-Vis and EPR-coupled spectroelectrochemistry supported by DFT calculations. One-electron withdrawal from the HOMO of 1, formed with a predominant contribution of the atrane N atom to the 3c-4e system, results in a short lived radical cation, in which the atrane nitrogen atom is almost planar and carries most of the spin density showing strong coupling with the protons of the axially directed C-H bonds of the three adjacent alpha-methylene groups (g = 2.0037, a(alpha)H(ax) = 37.93 G, a(alpha)H(lat) = 0.23 G and a(beta)H = 1.8 G). EPR spectroscopy and DFT calculations attest that the unpaired electron in the radical cation does not reside at the Si atom.
机译:通过DFT计算支持的伏安法,UV-Vis和EPR耦合的光谱电化学研究了CH3CN / 0.1M Bu4NPF6中的苯基硅烷(1)的电化学氧化。 从HOMO的单次取出1,形成为亚烷N原子对3C-4E系统的主要贡献,导致短暂的自由基阳离子,其中亚烷氮原子几乎是平面的并且携带大部分旋转 浓度显示与三个相邻的α-亚甲基的轴向指导的CH键的强耦合(g = 2.0037,a(α)h(ax)= 37.93g,a(α)h(alph)= 0.23g和 (β)h = 1.8g)。 EPR光谱和DFT计算证明了自由基阳离子中的未配对电子不存在于Si原子。

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