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Issue 24, 2009
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Periodic mesoporous organosilica containing ionic bis-aryl-imidazolium entities: Heterogeneous precursors for silica-hybrid-supported NHC complexes

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Abstract

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.

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

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Submitted
09 Jan 2009
Accepted
31 Mar 2009
First published
08 May 2009

J. Mater. Chem., 2009,19, 4164-4171
Article type
Paper

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

T. P. Nguyen, P. Hesemann, P. Gaveau and J. J. E. Moreau, J. Mater. Chem., 2009, 19, 4164
DOI: 10.1039/B900431A

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