Supramolecular self-organization in non-crystalline hybrid organic-Inorganic nanomaterials Induced by van der Waals Interactions

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Van der Waals induced supramolecular organization of hydrophobic tetrahedral units in the course of hydrolytic polycondensation

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Hydrophobic Induced Supramolecular Self-Organization of Tetrahedral Units based on van der Waals Interactions

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From molecular chemistry to hybrid nanomaterials. Design and functionalization

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Bifunctional ordered mesoporous materials: direct synthesis and study of the distribution of two distinct functional groups in the pore channels

International audienceIn this paper, we report the study of the distribution (regular or irregular distribution or segregation) of two distinct functional groups located within the pore channels of ordered mesoporous organosilicas. For that purpose, we have chosen two probes, both of them depending on the proximity of two organic groups. One was based on the chelating property towards EuCl3 of acetyl acetonate (acac) and carboxylate groups. The other concerns the ion-exchange capability of the sulfonic acid moieties, which depends on the proximity of the acid groups. In the first part, various ordered monofunctional mesoporous organosilicas were prepared by co-condensation of tetraethylorthosilicate (TEOS) and an organotriethoxysilane –(CH2)3–Si(OEt)3 (with = acetylacetonate (acac), CN, SH, Cl, NH2 and H) in the presence of the triblock copolymer P123 as a structure-directing agent at pH = 1.5. Thanks to the probes, we have first showed that all the organic groups (SH, CN, acac) are accessible and regularly distributed within the channel pores of monofunctional mesoporous materials. In the second part, several ordered mesoporous materials containing two distinct functional groups including at least one probe were prepared in one step by co-condensation of TEOS and two organotriethoxysilanes –(CH2)3–Si(OEt)3 and –(CH2)3–Si(OEt)3, under the same experimental conditions as previously. Taking into account the results obtained with the monofunctional materials as references, the distribution of two distinct functional groups located on the pores surfaces of mesoporous materials was determined and discusse

Functionalisation of the framework of mesoporous organosilicas by rare-earth complexes

International audienceA mesoporous hybrid material containing free phosphine oxide ligands in the pore walls was prepared in the presence of a structure-directing agent. The phosphine oxide ligands were proved to operate as templates for further erbium(III) and/or ytterbium(III) ion complexation

Pt(0)-Based Catalyst Supported on Silica Containing Di(ethylene oxide) Units for Hydrosilylation of Unsaturated Carbon-Carbon Bonds

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