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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.issued2015-10-15none
dc.identifier.other10.1039/C5RA15116C
dc.identifier.urihttp://edoc.hu-berlin.de/18452/19268
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.isoengnone
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 Wissenschaftennone
dc.titleQuantification of acidic sites of nanoscopic hydroxylated magnesium fluorides by FTIR and (15)N MAS NMR spectroscopynone
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/19268-3
dc.identifier.doihttp://dx.doi.org/10.18452/18572
dc.type.versionpublishedVersionnone
local.edoc.container-titleRSC Advancesnone
local.edoc.pages10none
local.edoc.anmerkungAvailable open access thanks to the RSC Gold for Gold initiative. Shared according to the terms set out in the CC licence.
local.edoc.type-nameZeitschriftenartikel
local.edoc.institutionMathematisch-Naturwissenschaftliche Fakultätnone
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
local.edoc.container-urlhttp://pubs.rsc.org/is/journals/journalissues/ranone
local.edoc.container-volume5none
local.edoc.container-issue109none
local.edoc.container-firstpage89659none
local.edoc.container-lastpage89668none
dc.description.versionPeer Reviewednone

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