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Interfacial Behavior of Orthoborate Ionic Liquids at Inorganic Oxide Surfaces Probed by NMR, IR, and Raman Spectroscopy
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. RISE Research Institutes of Sweden, Bioscience and Materials.ORCID iD: 0000-0002-8935-8070
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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
American Chemical Society , 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
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236740DOI: 10.1021/acs.jpcc.8b06049ISI: 000443923500041Scopus ID: 2-s2.0-85052316588OAI: oai:DiVA.org:kth-236740DiVA, id: diva2:1257658
Note

Export Date: 22 October 2018; Article; Correspondence Address: Shah, F.U.; Chemistry of Interfaces, Luleå University of TechnologySweden; email: faisha@ltu.se; 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.)), and the Norrbotten Research Council (NoFo) are gratefully acknowledged for supporting this work. We also thank the Foundation in memory of J. C. and Seth M. Kempe and the laboratory fond at LTU for providing grants, from which FTIR and Raman spectrometers have been purchased and a Varian/Chemagnetics CMX-360 NMR spectrometer at LTU has been upgraded. QC 20181022

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-22Bibliographically approved

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