Corner-opening and corner-capping of mono-substituted T₈ POSS: product distribution and isomerization

Abstract

We applied chromatographic and spectroscopic techniques to revisit the product distribution of the corner-opening and corner-capping reactions of monosubstituted T8 POSS. The monosubstituted Si is more likely to be removed...

Incorporation of Antimony Ions in Heptaisobutyl Polyhedral Oligomeric Silsesquioxanes

“…Finally, the absorptions at 3250 and 890 cm −1 were eroded and an intense band at 920 cm −1 and 985 cm −1 , attributed to the stretching of Si-O-Sb bonds for Sb(III)-POSS and Sb(V)-POSS, respectively, appeared evident in the spectra [56]. In general, this information indicates the success of the corner-capping reaction, with the production of a condensed structure [37,43,61,62]. In the case of the Sb(III)-POSS sample (Figure 2b), the band at approx.…”

Silsesquioxane Cages under Solvent Regimen: The Influence of the Solvent on the Hydrolysis and Condensation of Alkoxysilane

“…The authors formulated a hypothesis suggesting that "open" cages could be formed during alkaline hydrolysis through two potential mechanisms: (i) hydrolysis of Si−O−Si bonds and detachment of smaller silanol fragments; (ii) hydrolysis leading to the "cleaving" of the cage at specific bond sites, subsequently undergoing reorganization through condensation into open cages. To Hence, the hypothesis regarding the selectivity of the corneropening process, which aimed to yield heterosubstituted POSSs, was disproven, 38 and is still under investigation. 39 Inferences can be drawn that the hydrolysis process occurs in a stochastic manner.…”

“…Consequently, the hydrolysis of condensed octa -substituted POSSs culminates, and the subsequent phase involves self-assembling “open” cages through condensation. Hence, the hypothesis regarding the selectivity of the corner-opening process, which aimed to yield heterosubstituted POSSs, was disproven, 38 and is still under investigation. 100 …”

A Brief Review on Selected Applications of Hybrid Materials Based on Functionalized Cage-like Silsesquioxanes

“…Covalently bonded to the silicon core, the side arms are labile groups that enable various chemical reactions to be carried out on them and are effective nano-building blocks for, among others, supramolecular structures [ 7 , 8 , 9 ]. Depending on the number of reactive organic arms attached to the T 8 -type cage, there are mono-, di-, including ortho , meta , para diadducts, and octa-substituted derivatives ( Figure 2 ) [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”