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Preparation and solid state NMR characterization of phosphonates encapsulated in raw and organically modified SBA-15

Abstract : We present in this communication the preparation and the solid state NMR characterization of phenyl phosphonic acid encapsulated both in pure and aminopropyl-modified SBA-15 mesoporous silica materials. The 31P and 1H MAS studies revealed two radically different behaviors of the confined molecules. The included phosphonic acid in SBA-15 is submitted to a confinement effect that implies a weak interaction with the SiO2 surface and a relative mobility at room temperature. On the contrary, phenyl phosphonic acid molecules in the aminopropyl modified sample possess a strong interaction with the hybrid surface of the material. This finding is supported by a two dimensional double-quantum 1H experiment that revealed the close proximity between phenyl phosphonic acid and aminopropyl surface groups.
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https://hal.sorbonne-universite.fr/hal-02351642
Contributor : Guillaume Laurent <>
Submitted on : Wednesday, November 6, 2019 - 2:50:49 PM
Last modification on : Tuesday, September 22, 2020 - 3:40:03 AM

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Thierry Azaïs, Daniela Aiello, Flaviano Testa, Guillaume Laurent, Florence Babonneau. Preparation and solid state NMR characterization of phosphonates encapsulated in raw and organically modified SBA-15. 2009 MRS Fall Meeting, Nov 2009, Boston, MA, United States. pp.1227-JJ04-06, 1-6, ⟨10.1557/proc-1227-jj04-06⟩. ⟨hal-02351642⟩

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