The substitution of an O atom in the Cy8 Si8 O12 framework by a heteroatom or a heteroatom-containing group (Z) provides a simple route to discrete heterosilsesquioxane frameworks 1. In this reaction the Cy8 Si8 O12 framework is initially opened with triflic acid and then treated with different nucleophiles (Cy=cyclohexyl; Z=NPh, SO4 , nBuBO2 , CrO4 ).
The substitution of an O atom in the Cy8 Si8 O12 framework by a heteroatom or a heteroatom-containing group (Z) provides a simple route to discrete heterosilsesquioxane frameworks 1. In this reaction the Cy8 Si8 O12 framework is initially opened with triflic acid and then treated with different nucleophiles (Cy=cyclohexyl; Z=NPh, SO4 , nBuBO2 , CrO4 ).
Controlled cleavage of R8Si8O12 frameworks: a revolutionary new method for manufacturing precursors to hybrid inorganic–organic materials
作者:Frank J. Feher
DOI:10.1039/a707061f
日期:——
Cube-octameric polyhedral silsesquioxanes (R8Si8O12) react with strong acids (HX) to produce R8Si8O11X2 frameworks resulting from selective cleavage of one SiâOâSi linkage; subsequent hydrolysis affords R8Si8O11(OH)2 frameworks derived from the net hydrolysis of one SiâOâSi linkage in R8Si8O12; these results demonstrate for the first time that readily available R8Si8O12 frameworks can be used as precursors to incompletely condensed Si/O frameworks and have important implications for the manufacture of hybrid inorganicâorganic materials based on discrete polyhedral clusters of silicon and oxygen.