Isolable<i>p</i>- and<i>m</i>-[(<sup><i>t</i></sup>Bu<sub>2</sub>MeSi)<sub>2</sub>Si]<sub>2</sub>C<sub>6</sub>H<sub>4</sub>: Disilaquinodimethane vs Triplet Bis(silyl radical)
作者:Takeshi Nozawa、Michiyo Nagata、Masaaki Ichinohe、Akira Sekiguchi
DOI:10.1021/ja2014746
日期:2011.4.20
m-bis(halosilyl)benzenes 1 and 3, respectively, and were isolated and structurally characterized. The X-ray diffraction and solid-state NMR studies of 2 revealed its singlet quinodimethane structure featuring two exocyclic Si═C double bonds with some singlet biradical contribution. In contrast, the X-ray crystallography and EPR measurements of 4 disclosed its biradical nature, described as a triplet ground
异构的 p-和 m-disilaquinodimethanes 2 和 4 分别通过相应的 p-和 m-双 (卤代甲硅烷基) 苯 1 和 3 的还原脱卤合成,并进行了分离和结构表征。2 的 X 射线衍射和固态 NMR 研究揭示了其单线态醌二甲烷结构,具有两个环外 Si=C 双键和一些单线态双自由基贡献。相比之下,4 的 X 射线晶体学和 EPR 测量揭示了它的双自由基性质,描述为三重基态双(甲硅烷基自由基)。