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HISTORY OF BRIDGED SILSESQUIOXANES



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МеждконфSOL-GEL2021

HISTORY OF BRIDGED SILSESQUIOXANES 
Wong Chi Man M.
1
 
1
Institute Charles Gerhardt Montpellier, Department of "Hybrid Porous Materials", 
 Montpellier, France 
e-mail:
 
Michel.wong-chi-man@emcm.fr
 
In early 1990's, Bridged silsesquioxanes (
BS
) [1, 2] were introduced as a new family 
of hybrid silica-based materials and are obtained in a 1-step sol-gel hydrolysis-condensation of 
polytrialkoxyorganosilane precursors, [(Et0)
3
Si]
n
-
R with R as the central organic fragment 
connected to at least two trialkoxysilyl groups (Figure 1). Owing to the wide variety of organics 
that can be introduced, hybrid silsesquioxanes with targeted properties can be prepared. In 
this presentation the self- structuring of 
BS 
through self-assembly will be detailed [3] and the 
design of new organosilane precursors with sought-after properties to develop
BS
mainly for 
catalytic, optical and nananomedicine applications will be shown [4]. 
We also recently reported the synthesis of new functional silsesquioxane T
n
cages (n = 8, 
10, 12 and 
18) by a Fluoride-catalyzed 
hydrolysis 
of a mono trialkoxysilane 
(styryltyriethoxysilane) [5]. The latter cage with n = 18 is the largest cage silsesquioxane ever 
reported. These works are being developed to produce well-defined cage-like silsesquioxanes 
starting from these different cage sizes (Figure 1). 


СЕКЦИЯ 4. «ГИБРИДНЫЕ НЕОРГАНИЧЕСКИЕ И ОРГАНО-
НЕОРГАНИЧЕСКИЕ ЗОЛЬ-ГЕЛЬ МАТЕРИАЛЫ» 
74 
Fig. 2.
2-step synthesis of Bridged Silsesquioxanes from functional mono(triethoxy)silane 
precursors 

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