Structural Change upon One-Electron Reduction of an Isolable Dialkylsilylene
作者:Takashi Abe、Shintaro Ishida、Takeaki Iwamoto
DOI:10.1246/bcsj.20170380
日期:2018.4.15
Dialkyl(potassio)silyl radical 6a[K(18-crown-6)] and dialkylsilylene radicalanion 6b[K([2.2.2]cryptand)] were synthesized by the one-electron reduction of dialkylsilylene 5 and characterized by X-ray diffractional analysis and EPR spectroscopy. The structural change from 5 to 6b upon the one-electron reduction can be explained by reduced σ(Si–C) → 3p(Siα) orbital interactions.
The new isolabledialkylsilylene 3 bearing a bidentate alkyl substituent was synthesized. Recrystallization of silylene 3 gave yellow crystals of 3 and orange-red crystals of tetraalkyldisilene 4, a dimer of 3. In the solid state, 3 exists as a monomer with a closest distance of 6.745 Å between dicoordinate silicon atoms, while disilene 4 has a remarkably long Si═Si double bond distance of 2.252 Å