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The use of multiple probe molecules for the study of the acid-base properties of aluminium hydroxyfluoride having the hexagonal tungsten bronze structure: FTIR and [<sup>36</sup>Cl] radiotracer studies</strong>

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDAMBOURNET, Damien
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorLECLERC, Hervé
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorVIMONT, Alexandre
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorLAVALLEY, Jean-Claude
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorNICKKHO-AMIRY, Mahmood
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorDATURI, Marco
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorWINFIELD, John M.
dc.date.issued2009
dc.identifier.issn1463-9076
dc.description.abstractEnThe combination of several probe molecules has enabled the construction of a detailed picture of the surface of aluminium hydroxyl fluoride, AlF<sub>2.6</sub>(OH)<sub>0.4</sub>, which has the hexagonal tungsten bronze (HTB) structure. Using pyridine as a probe leads to features at 1628 cm<sup>-1</sup>, ascribed to very strong Lewis acid sites, and at 1620-1623 cm<sup>-1</sup>, which is the result of several different types of Lewis sites. This heterogeneity is indicated also from CO adsorption at 100 K; the presence of five different types of Lewis site is deduced and is suggested to arise from the hydroxylated environment. Brønsted acid sites of medium strength are indicated by adsorption of lutidine and CO. Adsorption of lutidine occurs at OH groups, which are exposed at the surface and CO reveals that these OH groups have a single environment that can be correlated with their specific location inside the bulk, assuming that the surface OH group may reflect the bulk OH periodicity. A correlation between the data obtained from CO and pyridine molecules has been established using co-adsorption experiments, which also highlight the inductive effect produced by pyridine. Adsorption of the strong Brønsted acid, anhydrous hydrogen chloride, detected by monitoring the <sup>-</sup> emission of [<sup>36</sup>Cl]-HCl at the surface, indicates that surface hydroxyl groups can behave also as a Brønsted base and that H<sub>2</sub>O-HCl interactions, either within the hexagonal channels or at the surface are possible. Finally, the formation of strongly bound H<sup>36</sup>Cl as a result of the room temperature dehydrochlorination of [<sup>36</sup>Cl]-labelled <i>tert</i>-butyl chloride provides additional evidence that HTB-AlF<sub>2.6</sub>(OH)<sub>0.4</sub> can behave as a Lewis acid.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enFTIR
dc.subject.enAluminium hydroxyfluoride
dc.subject.enAcid-base
dc.subject.enChemical properties
dc.title.enThe use of multiple probe molecules for the study of the acid-base properties of aluminium hydroxyfluoride having the hexagonal tungsten bronze structure: FTIR and [<sup>36</sup>Cl] radiotracer studies</strong>
dc.typeArticle de revue
dc.identifier.doi10.1039/b811691a
dc.subject.halChimie/Matériaux
bordeaux.journalPhysical Chemistry Chemical Physics
bordeaux.page1369-1379-
bordeaux.volume11
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-00366642
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00366642v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Physical%20Chemistry%20Chemical%20Physics&amp;rft.date=2009&amp;rft.volume=11&amp;rft.issue=9&amp;rft.spage=1369-1379-&amp;rft.epage=1369-1379-&amp;rft.eissn=1463-9076&amp;rft.issn=1463-9076&amp;rft.au=DAMBOURNET,%20Damien&amp;LECLERC,%20Herv%C3%A9&amp;VIMONT,%20Alexandre&amp;LAVALLEY,%20Jean-Claude&amp;NICKKHO-AMIRY,%20Mahmood&amp;rft.genre=article


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