Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2021

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

Résumé

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.

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hal-03331616 , version 1 (15-11-2021)

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Masashi Yatomi, Masakazu Koike, Nadège Rey, Yuki Murakami, Shohei Saito, et al.. Interlayer Silylation of Layered Octosilicate with Organoalkoxysilanes: Effects of Tetrabutylammonium Fluoride as a Catalyst and the Functional Groups of Silanes. European Journal of Inorganic Chemistry, 2021, 2021 (19), pp.1836-1845. ⟨10.1002/ejic.202100050⟩. ⟨hal-03331616⟩
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