Interlayer Silylation of Layered Octosilicate with Organoalkoxysilanes: Effects of Tetrabutylammonium Fluoride as a Catalyst and the Functional Groups of Silanes

Masashi Yatomi, Masakazu Koike, Nadège Rey, Yuki Murakami, Shohei Saito, Hiroaki Wada, Atsushi Shimojima, David Portehault, Sophie Carenco, Clément Sanchez, Carole Carcel, Michel Wong Chi Man, Kazuyuki Kuroda

Research output: Contribution to journalArticlepeer-review

Abstract

Interlayer silylation of layered sodium octosilicate (Na-Oct) with various organoalkoxysilanes was conducted using hexadecyltrimethylammonium ion-exchanged layered octosilicate (C16TMA-Oct) as an intermediate in the presence or absence of tetrabutylammonium fluoride (TBAF). The degree of silylation was increased by adding TBAF. It is suggested that F ions perform a nucleophilic attack on the alkoxysilanes, which promotes the silylation reaction. C16TMA-Oct was silylated with octyltriethoxysilane (C8TES) or 3-mercaptopropyltriethoxysilane (MPTES) to compare the reactivity of the two organoalkoxysilanes in the presence or absence of TBAF. A higher degree of silylation of C16TMA-Oct was observed with MPTES, suggesting the higher accessibility of this silylating agent into the interlayer polar region of C16TMA-Oct. Overall TBAF appears as a relevant catalyst for the covalent interlayer surface modification of layered silicates with organic functional groups.

Original languageEnglish
Pages (from-to)1836-1845
Number of pages10
JournalEuropean Journal of Inorganic Chemistry
Volume2021
Issue number19
DOIs
Publication statusPublished - 2021 May 20

Keywords

  • Layered compounds
  • Mesoporous materials
  • Organotriethoxysilane
  • Silylation
  • Tetrabutylammonium fluoride (TBAF)

ASJC Scopus subject areas

  • Inorganic Chemistry

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