Synthesis and Properties of Spiro‐double Sila[7]helicene: The LUMO Spiro‐conjugation
作者:Nozomi Terada、Keisuke Uematsu、Ryota Higuchi、Yuki Tokimaru、Yosuke Sato、Koji Nakano、Kyoko Nozaki
DOI:10.1002/chem.202100385
日期:2021.6.25
spirosilabi[fluorene] moiety, the two helicene units in 4 are symmetrically and nearly perpendicularly arranged. (P,P)-4 and (M,M)-4 exhibit unique optical properties attributable to the LUMO spiro-conjugation between the two sila[7]helicene units.
通过在SiCl 4上进行四个连续的亲核取代,合成了具有螺-Si 接头( 4 )的双螺旋。其( P,P )、( M,M )和( P,M )异构体被分离出来并通过单晶X射线分析表征。由于中心的螺硅[芴]部分,4中的两个螺旋单元对称且几乎垂直排列。( P,P )- 4和 ( M, M )- 4表现出独特的光学性质,这归因于两个 sila[7] 螺旋单元之间的 LUMO 螺共轭。