Organic–inorganic hybrid silica: chemical reactivity as a tool for studying the solid arrangement as a function of molecular structure

Cerveau, Geneviève; Corriu, Robert J. P.; Lepeytre, Cédric

doi:10.1039/jm9950500793

Cited by 42 publications

(29 citation statements)

References 20 publications

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“…This result is in agreement with the hydrophobicity observed for these solids, and also with the electrochemical behaviour 2 and the chemical reactivity [3][4][5] of the corresponding hybrid gels. In the case of monophasic hybrid solids obtained by hydrolytic condensation of polysilylated precursors, the knowledge of the location of the organic moiety, at the surface or in the bulk, is of great interest (Scheme 1).…”

supporting

confidence: 91%

“…1(a)). Moreover, the ions [CH 3 Si] or [CH 2 Si] were never detected in the case of the bis-silylated xerogel X1.…”

Section: Tof Secondary Ion Mass Spectrometric Characterization Of Thementioning

confidence: 83%

“…In a previous work 1 we demonstrated that TOF-SIMS is an efficient tool for analysing the surface composition of monophasic hybrid organic-inorganic materials obtained by sol-gel hydrolysis-polycondensation of trialkoxysilanes RSi(OR') 3 .…”

mentioning

confidence: 99%

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Characterization of the surface organization of nanostructured hybrid organic-inorganic materials by time-of-flight secondary ion mass spectrometry

Cerveau

Corriu

Dabosi

et al. 1999

Rapid Commun. Mass Spectrom.

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Time-of-flight secondary ion mass spectrometry (TOF-SIMS) has been used to analyse the surface composition of organic-inorganic hybrid solids obtained by a sol-gel process. Gels of type O(1.5)Si-R-SiO(1. 5), obtained from bis-silylated precursors (R'O)(3)-R-Si(OR')(3) (R' = Me, Et and R = (-CH(2))(n)-, n = 1, 2, 6, 10, 12;--CH=CH-; (-CH(2))(3)NH(CH(2))(3)-; 1, 1'-ferrocenyl; (CH(2))(n)-Ph-(CH(2))(n)- with Ph = 1,4-phenylene and n = 0, 1, 2; Ph = 1,3,5-phenyl and n = 0) were analysed. The results were highly dependent on the nature of the organic group. When the organic group was small or 'rigid', the main peaks detected corresponded to SiOH and SiOR' residual groups. Fragment ions from the organic group were poorly detected in this case. When the organic group was larger and more 'flexible', characteristic mass fragment ions were detected at higher relative intensities, indicative of a different organization of the organic units in the solid. TOF-SIMS clearly showed the differences between the xerogels derived from mono- and bis-silylated organic precursors : the organic group is present at the surface of mono-silylated xerogels, whereas for bis-silylated ones, the organization is dependent on the length and the flexibility of the organic units. These TOF-SIMS results are in agreement with other features already reported. Copyright 1999 John Wiley & Sons, Ltd.

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supporting

confidence: 91%

“…1(a)). Moreover, the ions [CH 3 Si] or [CH 2 Si] were never detected in the case of the bis-silylated xerogel X1.…”

Section: Tof Secondary Ion Mass Spectrometric Characterization Of Thementioning

confidence: 83%

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Characterization of the surface organization of nanostructured hybrid organic-inorganic materials by time-of-flight secondary ion mass spectrometry

Cerveau

Corriu

Dabosi

et al. 1999

Rapid Commun. Mass Spectrom.

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“…[60,61,63] The chemical reactivity corroborates these facts: R groups located at the surface are chemically accessible and highly reactive. Two examples are the facile complexation of phenyl groups by Cr(CO) 3 in phenyl silsesquioxanes, [62] and the transformation of HSiO 1.5 into oxynitride by reaction in a simple flow of NH 3 [63] (Scheme 15). HSi(OEt) 3 HSiO 1.5…”

Section: Monocomponent Hybrids With Only One Si à C Bondmentioning

confidence: 99%

Ceramics and Nanostructures from Molecular Precursors

Corriu

2000

Angew. Chem. Int. Ed.

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332

198

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The elaboration of solids from the molecular scale by a kinetically controlled methodology is one of the main challenges of molecular chemistry. In the long term, this should permit the design of solids with desired properties. Here, some examples are given which show a few methods that have been used for the preparation of solids from molecular precursors. The one-pot synthesis of rheologically controlled SiC is described. Access to a new kind of ceramic is obtained by the same methodology using molecular precursors. Mixed ceramics with interpenetrating networks are not accessible by the chemical thermodynamic route. The chemistry of hybrid materials obtained from molecular precursors through inorganic polymerization is presented. This class of materials offers wide perspectives because of 1) the large possibilities opened by the organic unit, 2) the kinetic control, which permits any kind of texture for the solid, and 3) the aptitude of these solids to become nanostructured.

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“…The reactivity of aromatic groups bound to silica matrix towards Cr(CO) 6 will be given as an example [52][53][54].…”

Section: Coordination Chemistry In the Solidmentioning

confidence: 99%

Nanoporous materials: a good opportunity for nanosciences

Corriu

Mehdi

Reyé

2004

Journal of Organometallic Chemistry

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Organic–inorganic hybrid silica: chemical reactivity as a tool for studying the solid arrangement as a function of molecular structure

Abstract: Chemical reactivity and hydrophilicity studies in organic-inorganic hybrid materials have revealed that the arrangement of organic units in a silica matrix depends on the molecular structure of the precursor.

Cited by 42 publications

References 20 publications

Characterization of the surface organization of nanostructured hybrid organic-inorganic materials by time-of-flight secondary ion mass spectrometry

Characterization of the surface organization of nanostructured hybrid organic-inorganic materials by time-of-flight secondary ion mass spectrometry

Ceramics and Nanostructures from Molecular Precursors

Nanoporous materials: a good opportunity for nanosciences

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