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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Propanoate grafting on (H,OH)-Si(0 0 1)-2 × 1.

Fabrice Bournel¹, Jean-Jacques Gallet, Ulrich Köhler

¹Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif sur Yvette Cedex, France. Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique, Matière et Rayonnement, 11 rue Pierre et Marie Curie, 75231 Paris Cedex, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 22, 2014

Summary

This summary is machine-generated.

Propanoic acid reacts with water-covered silicon surfaces, forming a propanoate layer. This chemisorption involves hydrogen bonding with surface hydroxyls, suggesting pathways for water elimination and ester formation.

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Area of Science:

Surface Science
Materials Chemistry
Chemical Kinetics

Background:

The reactivity of silicon surfaces with organic molecules is crucial for semiconductor fabrication and functionalization.
Understanding the adsorption mechanisms of carboxylic acids on silicon is key to developing new surface modification strategies.

Purpose of the Study:

To investigate the chemisorption of propanoic acid on water-covered Si(001)-2×1 surfaces.
To elucidate the reaction mechanism, including the role of surface hydroxyls and potential reaction pathways.

Main Methods:

X-ray Photoelectron Spectroscopy (XPS) for electronic structure analysis.
Near-Edge X-ray Absorption Fine Structure (NEXAFS) for electronic structure.
High-Resolution Electron Energy Loss Spectroscopy (HREELS) for vibrational spectra.

Main Results:

Propanoic acid chemisorbs on the Si(001) surface as a propanoate species.
Adsorption leads to significant perturbation of surface hydroxyl electronic and vibrational properties, indicating hydrogen bonding.
Evidence suggests surface hydroxyls actively participate in the adsorption reaction.

Conclusions:

The chemisorption of propanoic acid on Si(001) proceeds via surface hydroxyls.
Both concerted and radical-mediated pathways involving silicon dangling bonds are proposed for water elimination and ester formation.