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Interfacial Behavior of Orthoborate Ionic Liquids at Inorganic Oxide Surfaces Probed by NMR, IR, and Raman Spectroscopy
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-8935-8070
Ghent University, Belgium.
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2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 34, p. 19687-19698Article in journal (Refereed) Published
Abstract [en]

Absorption modes and the reactivity of nonhalogenated ionic liquids (ILs) at inorganic oxide surfaces of γ-Al2O3, MgO, and SiO2 particles were characterized using multinuclear (11B, 31P, and 29Si) solid-state magic-angle-spinning NMR, FTIR, and Raman spectroscopy. ILs are composed of the trihexyl(tetradecyl)phosphonium cation, [P6,6,6,14]+, and bis(mandelato)borate, [BMB]-, or bis(salicylato)borate, [BScB]-, anions. Spectroscopic measurements were performed on room-temperature (298 K) samples and samples exposed to 15 h at 373 K. The single-pulse 11B NMR data of heated [P6,6,6,14][BMB] mixed with the inorganic oxides showed a significant change in the spectra of the anion for all three oxides. In contrast, no such spectral changes were detected for heated [P6,6,6,14][BScB] mixed with the inorganic oxides. 31P MAS NMR data for the IL/metal oxide systems revealed interactions between [P6,6,6,14]+ and the surfaces of oxides. A significant intensity of 31P CP-MAS NMR signals indicated a low mobility of cations in these systems. The existence of strongly adhered surface layers of ILs on SiO2 particles was also confirmed by 1H-29Si CP-MAS NMR spectroscopy. FTIR and Raman spectroscopic data revealed strong interactions between the anions and the inorganic surfaces, and there is a strong correlation with the data obtained from NMR spectroscopy. Although their chemical structures are rather similar, the [BScB]- anion is more stable than the [BMB]- anion at the inorganic oxide surfaces.

Place, publisher, year, edition, pages
2018. Vol. 122, no 34, p. 19687-19698
Keywords [en]
Alumina, Aluminum oxide, Ionic liquids, Magic angle spinning, Magnesia, Negative ions, Nuclear magnetic resonance spectroscopy, Positive ions, Raman spectroscopy, Silica, Inorganic surfaces, Interfacial behaviors, Ionic liquid (ils), IR and Raman spectroscopy, Phosphonium cations, Solid state magic angle spinning NMR, Spectroscopic measurements, Strong interaction, Fourier transform infrared spectroscopy
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35645DOI: 10.1021/acs.jpcc.8b06049Scopus ID: 2-s2.0-85052316588OAI: oai:DiVA.org:ri-35645DiVA, id: diva2:1261165
Note

Funding details: LTU, Luther Theological University; Funding details: 621-2013-5171, VR, Vetenskapsrådet; Funding details: 621-2014-4694, VR, Vetenskapsrådet; Funding details: KAW2012.0078, Knut och Alice Wallenbergs Stiftelse; Funding text: The Knut and Alice Wallenberg Foundation (project number KAW2012.0078), Swedish Research Council (projects numbers 621-2013-5171 (O.N.A. and F.U.S.) and 621-2014-4694 (S.G

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved

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