Surface organometallic chemistry of main group elements: Selective synthesis of silica supported [Si-OB(C6F5)3] [HNEt2Ph]+

Nicolas Millot; Andrew Cox; Catherine C. Santini; Yann Molard; Jean-Marie Maurice Basset

doi:10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9

Surface organometallic chemistry of main group elements: Selective synthesis of silica supported [Si-OB(C₆F₅)₃] [HNEt₂Ph]⁺

Nicolas Millot, Andrew Cox, Catherine C. Santini^*, Yann Molard, Jean-Marie Maurice Basset

^*Corresponding author for this work

Physical Sciences and Engineering

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The reaction of the Lewis acid B(C₆F₅)₃ with silanol groups of silica surfaces, dehydroxylated at different temperatures (300, 500, 700, and 800°C), has been investigated in presence of the Brønsted base NEt₂Ph. The structure of the resulting modified silica supports [Si-OB(C₆F₅)₃]- [HNEt₂Ph]⁺ (1) has been carefully identified by IR and multinuclear solid-state NMR spectroscopies, isotopic ²H and ¹⁸O labeling, elemental analysis, molecular modeling, and comparison with synthesized molecular models. Highly dehydroxylated silica surfaces were required to transform selectively each silanol group into unique [Si-OB(C₆F₅)₃]- [HNEt₂Ph]⁺ fragments. For lower dehydroxylation temperatures, two sorts of surface sites were coexisting on silica: the free silanol groups [SiOH] and the ionic species 1.

Original language	English (US)
Pages (from-to)	1438-1442
Number of pages	5
Journal	Chemistry - A European Journal
Volume	8
Issue number	6
DOIs	https://doi.org/10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9
State	Published - Mar 15 2002

Keywords

Ion pairs
Silica
Supported ammonium
Supported borate
Surface chemistry

ASJC Scopus subject areas

General Chemistry

Access to Document

10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9

Cite this

@article{4e5da8a2e7e94d8d83ec005f28a2d669,

title = "Surface organometallic chemistry of main group elements: Selective synthesis of silica supported [Si-OB(C6F5)3] [HNEt2Ph]+",

abstract = "The reaction of the Lewis acid B(C6F5)3 with silanol groups of silica surfaces, dehydroxylated at different temperatures (300, 500, 700, and 800°C), has been investigated in presence of the Br{\o}nsted base NEt2Ph. The structure of the resulting modified silica supports [Si-OB(C6F5)3]- [HNEt2Ph]+ (1) has been carefully identified by IR and multinuclear solid-state NMR spectroscopies, isotopic 2H and 18O labeling, elemental analysis, molecular modeling, and comparison with synthesized molecular models. Highly dehydroxylated silica surfaces were required to transform selectively each silanol group into unique [Si-OB(C6F5)3]- [HNEt2Ph]+ fragments. For lower dehydroxylation temperatures, two sorts of surface sites were coexisting on silica: the free silanol groups [SiOH] and the ionic species 1.",

keywords = "Ion pairs, Silica, Supported ammonium, Supported borate, Surface chemistry",

author = "Nicolas Millot and Andrew Cox and Santini, {Catherine C.} and Yann Molard and Basset, {Jean-Marie Maurice}",

year = "2002",

month = mar,

day = "15",

doi = "10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9",

language = "English (US)",

volume = "8",

pages = "1438--1442",

journal = "Chemistry - A European Journal",

issn = "0947-6539",

publisher = "Wiley-VCH Verlag",

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T1 - Surface organometallic chemistry of main group elements

T2 - Selective synthesis of silica supported [Si-OB(C6F5)3] [HNEt2Ph]+

AU - Millot, Nicolas

AU - Cox, Andrew

AU - Santini, Catherine C.

AU - Molard, Yann

AU - Basset, Jean-Marie Maurice

PY - 2002/3/15

Y1 - 2002/3/15

N2 - The reaction of the Lewis acid B(C6F5)3 with silanol groups of silica surfaces, dehydroxylated at different temperatures (300, 500, 700, and 800°C), has been investigated in presence of the Brønsted base NEt2Ph. The structure of the resulting modified silica supports [Si-OB(C6F5)3]- [HNEt2Ph]+ (1) has been carefully identified by IR and multinuclear solid-state NMR spectroscopies, isotopic 2H and 18O labeling, elemental analysis, molecular modeling, and comparison with synthesized molecular models. Highly dehydroxylated silica surfaces were required to transform selectively each silanol group into unique [Si-OB(C6F5)3]- [HNEt2Ph]+ fragments. For lower dehydroxylation temperatures, two sorts of surface sites were coexisting on silica: the free silanol groups [SiOH] and the ionic species 1.

AB - The reaction of the Lewis acid B(C6F5)3 with silanol groups of silica surfaces, dehydroxylated at different temperatures (300, 500, 700, and 800°C), has been investigated in presence of the Brønsted base NEt2Ph. The structure of the resulting modified silica supports [Si-OB(C6F5)3]- [HNEt2Ph]+ (1) has been carefully identified by IR and multinuclear solid-state NMR spectroscopies, isotopic 2H and 18O labeling, elemental analysis, molecular modeling, and comparison with synthesized molecular models. Highly dehydroxylated silica surfaces were required to transform selectively each silanol group into unique [Si-OB(C6F5)3]- [HNEt2Ph]+ fragments. For lower dehydroxylation temperatures, two sorts of surface sites were coexisting on silica: the free silanol groups [SiOH] and the ionic species 1.

KW - Ion pairs

KW - Silica

KW - Supported ammonium

KW - Supported borate

KW - Surface chemistry

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U2 - 10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9

DO - 10.1002/1521-3765(20020315)8:6<1438::AID-CHEM1438>3.0.CO;2-9

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SN - 0947-6539

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EP - 1442

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

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