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2015-10-15Zeitschriftenartikel DOI: 10.18452/18572
Quantification of acidic sites of nanoscopic hydroxylated magnesium fluorides by FTIR and (15)N MAS NMR spectroscopy
dc.contributor.authorHemman, Felix
dc.contributor.authorAgirrezabal-Telleria, Iker
dc.contributor.authorJaeger, Christian
dc.contributor.authorKemnitz, Erhard
dc.date.accessioned2017-11-24T10:32:53Z
dc.date.available2017-11-24T10:32:53Z
dc.date.issued2015-10-15
dc.identifier.urihttp://edoc.hu-berlin.de/18452/19268
dc.descriptionAvailable open access thanks to the RSC Gold for Gold initiative. Shared according to the terms set out in the CC licence.
dc.description.abstractLewis and Brønsted sites were quantified in a series of weak acidic hydroxylated magnesium fluorides by Fourier transform infrared spectroscopy (FTIR) and solid state nuclear magnetic resonance spectroscopy (NMR) with pyridine as probe molecule. Molar extinction coefficients, which are necessary for quantitative FTIR measurements, were calculated by an easy approach. It utilizes the fact that both signals, used for the quantification by FTIR, are caused by the same deformation vibration mode of pyridine. Comparison of quantitative FTIR experiments and quantification by NMR shows that concentrations of acidic sites determined by FTIR spectroscopy have to be interpreted with caution. Furthermore, it is shown that the transfer of molar extinction coefficients from one catalyst to another may lead to wrong results. Molar extinction coefficients and concentrations of acidic sites determined by FTIR spectroscopy are affected by grinding and probably the particle size of the sample. High temperature during FTIR experiments has further impact on the quantification results.eng
dc.language.isoeng
dc.publisherHumboldt-Universität zu Berlin
dc.rights(CC BY 3.0) Namensnennung 3.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaften
dc.titleQuantification of acidic sites of nanoscopic hydroxylated magnesium fluorides by FTIR and (15)N MAS NMR spectroscopy
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/19268-3
dc.identifier.doihttp://dx.doi.org/10.18452/18572
dc.type.versionpublishedVersion
local.edoc.pages10
local.edoc.type-nameZeitschriftenartikel
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
dc.description.versionPeer Reviewed
dcterms.bibliographicCitation.doi10.1039/C5RA15116C
dcterms.bibliographicCitation.journaltitleRSC Advances
dcterms.bibliographicCitation.volume5
dcterms.bibliographicCitation.issue109
dcterms.bibliographicCitation.pagestart89659
dcterms.bibliographicCitation.pageend89668
bua.departmentMathematisch-Naturwissenschaftliche Fakultät

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