Crystal structures of three sterically congested disilanes

Abstract

Three sterically congested silanes, namely 1,1,2,2-tetra­isopropyl-1,2-di­phenyl­disilane, 1,1,2,2-tetra­kis­(2-bromo­propan-2-yl)-1,2-di­phenyl­disilane and 1,2-di-tert-butyl-1,1,2,2-tetra­phenyl­disilane, show lengthening of the Si—Si and Si—C bonds as compared with disilanes with smaller substituents. The packing of the tetra­kis­(2-bromo­propan-2-yl) compound is partly organized by attractive Br⋯Br inter­actions.

Isolation of a Cyclopentasilane from Magnesium Reduction of a Linear Hexasilane

“…The SiÀ Si bond distance (d SiÀ Si ) of 2.3483(7) Å was slightly shorter than the analogous d SiÀ Si observed for the related compounds i Pr 2 PhSi-SiPh i Pr 2 (2.3898(4) Å) and t BuPh 2 Si-SiPh 2 t Bu (2.4002(6) Å). [45] The structural assignment to 1,2-dihydrodisilane 8 was supported by extensive spectroscopic analysis. FTIR spectroscopy showed the presence of a sharp stretching frequency at v˜= 2093 cm À 1 consistent with a SiÀ H bond, but a strong, broad feature at ca.…”