Infrared investigation of the acid and basic properties of a sol-gel prepared MgF2

Stefan Wuttke; Alexandre Vimont; Jean Claude Lavalley; Marco Daturi; Erhard Kemnitz

doi:10.1021/jp911584h

Infrared investigation of the acid and basic properties of a sol-gel prepared MgF₂

Stefan Wuttke, Alexandre Vimont, Jean Claude Lavalley, Marco Daturi, Erhard Kemnitz

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

45 Citations (Scopus)

Abstract

This Article reports the use of FTIR spectroscopy of adsorbed probe molecules for the characterization of the acidity and basicity of sol-gel prepared MgF₂. The CO adsorption shows that this material possesses 3-, 4-and 5-fold coordinated unsaturated magnesium atoms on the surface. The strength of these Lewis acid sites is medium or weak, but their number is very high (5-6 sites/nm²). Whereas chloroform mainly adsorbs on Lewis acid sites, pyrrole adsorption reveals the presence of weak basic sites which are the first evidence of the basicity of fluorine atoms on the surface of metal fluorites. Both Lewis basic and acidic sites play a role in water adsorption, which is adsorbed on the surface at room temperature.

Original language	English
Pages (from-to)	5113-5120
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	114
Issue number	11
DOIs	https://doi.org/10.1021/jp911584h
Publication status	Published - Mar 25 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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abstract = "This Article reports the use of FTIR spectroscopy of adsorbed probe molecules for the characterization of the acidity and basicity of sol-gel prepared MgF2. The CO adsorption shows that this material possesses 3-, 4-and 5-fold coordinated unsaturated magnesium atoms on the surface. The strength of these Lewis acid sites is medium or weak, but their number is very high (5-6 sites/nm2). Whereas chloroform mainly adsorbs on Lewis acid sites, pyrrole adsorption reveals the presence of weak basic sites which are the first evidence of the basicity of fluorine atoms on the surface of metal fluorites. Both Lewis basic and acidic sites play a role in water adsorption, which is adsorbed on the surface at room temperature.",

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AU - Wuttke, Stefan

AU - Vimont, Alexandre

AU - Lavalley, Jean Claude

AU - Daturi, Marco

AU - Kemnitz, Erhard

PY - 2010/3/25

Y1 - 2010/3/25

N2 - This Article reports the use of FTIR spectroscopy of adsorbed probe molecules for the characterization of the acidity and basicity of sol-gel prepared MgF2. The CO adsorption shows that this material possesses 3-, 4-and 5-fold coordinated unsaturated magnesium atoms on the surface. The strength of these Lewis acid sites is medium or weak, but their number is very high (5-6 sites/nm2). Whereas chloroform mainly adsorbs on Lewis acid sites, pyrrole adsorption reveals the presence of weak basic sites which are the first evidence of the basicity of fluorine atoms on the surface of metal fluorites. Both Lewis basic and acidic sites play a role in water adsorption, which is adsorbed on the surface at room temperature.

AB - This Article reports the use of FTIR spectroscopy of adsorbed probe molecules for the characterization of the acidity and basicity of sol-gel prepared MgF2. The CO adsorption shows that this material possesses 3-, 4-and 5-fold coordinated unsaturated magnesium atoms on the surface. The strength of these Lewis acid sites is medium or weak, but their number is very high (5-6 sites/nm2). Whereas chloroform mainly adsorbs on Lewis acid sites, pyrrole adsorption reveals the presence of weak basic sites which are the first evidence of the basicity of fluorine atoms on the surface of metal fluorites. Both Lewis basic and acidic sites play a role in water adsorption, which is adsorbed on the surface at room temperature.

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Infrared investigation of the acid and basic properties of a sol-gel prepared MgF₂

Abstract

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