Periodic mesoporous organosilica containing ionic bis-aryl-imidazolium entities: Heterogeneous precursors for silica-hybrid-supported NHC complexes

The synthesis of periodic mesoporous organosilica incorporating ionic diarylimidazolium species was achieved by hydrolysis-polycondensation of a bis-silylated diarylimidazolium (Si-IMes-) precursor in the presence of non-ionic triblock copolymer as structure directing agents. Although hydrolysis pol...

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Published in:Journal of materials chemistry 2009-01, Vol.19 (24), p.4164-4171
Main Authors: THY PHUONG NGUYEN, HESEMANN, Peter, GAVEAU, Philippe, MOREAU, Joël J. E
Format: Article
Language:English
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Chemical Sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Organic chemistry
Other materials
Physics
Porous materials
granular materials
Specific materials
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cited_by cdi_FETCH-LOGICAL-c419t-87f2e2e98149985c7d3c793fa260eb335d2eb869e741cb56e15b8ee467fc28af3
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description The synthesis of periodic mesoporous organosilica incorporating ionic diarylimidazolium species was achieved by hydrolysis-polycondensation of a bis-silylated diarylimidazolium (Si-IMes-) precursor in the presence of non-ionic triblock copolymer as structure directing agents. Although hydrolysis polycondensation of the pure precursor gave materials with moderate porosity, highly porous solids were obtained by the addition of tetraethoxysilane (TEOS) to the sol solution. The architecture of the materials on a mesoscopic scale strongly depends on the TEOS/Si-IMes ratio in the sol. Materials with highly regular hexagonal symmetry were obtained using high molar excess of TEOS. The obtained PMO type materials incorporating diarylimidazolium substructures are promising heterogeneous precursors for the formation of silica hybrid supported N-heterocyclic carbene complexes and therefore have great potential in heterogeneous catalysis.
doi_str_mv 10.1039/b900431a
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subjects Chemical Sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Organic chemistry
Other materials
Physics
Porous materials
granular materials
Specific materials
title Periodic mesoporous organosilica containing ionic bis-aryl-imidazolium entities: Heterogeneous precursors for silica-hybrid-supported NHC complexes
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