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Analysis of the behaviour of confined molecules using 2H T1 nuclear magnetic relaxation dispersion
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0002-9277-4534
2019 (English)In: Molecular Physics, ISSN 0026-8976, E-ISSN 1362-3028Article in journal (Refereed) Epub ahead of print
Abstract [en]

A four-site exchange model is developed in order to explain deuterium -nuclear magnetic relaxation dispersion (NMRD) profiles of acetonitrile in silica pore systems. The four-site exchange model comprises a bulk, surface and two types of burried or cavity sites. It is found that the residence time of acetonitrile- at a flat Si-surface is less than 100 ps. No bilayer-like ordering of acetonitrile is formed at the Si-surface because no quadrupole splitting was observed. The dispersion in the deuterium T1-NMRD profiles are due to relatively few so-called beta-sites with molecular residence time in the range 0.2-2 micro seconds. This deuterium T-NMR dispersion experiment suggest that the retention time of different analysts can be studied in terms of their residence time in beta sites.

Place, publisher, year, edition, pages
Taylor & Francis, 2019.
Keywords [en]
Spin-lattice relaxation time of acetonitrile-d3, NMRD, molecular origin of the retention time, 4-site exchange model
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-162676DOI: 10.1080/00268976.2019.1645367ISI: 000479433000001OAI: oai:DiVA.org:umu-162676DiVA, id: diva2:1347737
Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02

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Sparrman, TobiasWestlund, Per-Olof

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