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NMR longitudinal relaxation enhancement in metal halides by heteronuclear polarization exchange during magic-angle spinning
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
2016 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 144, no 22, 224201Article in journal (Refereed) PublishedText
Abstract [en]

Orders of magnitude decrease of Pb-207 and Hg-199 NMR longitudinal relaxation times T-1 upon magic-angle-spinning (MAS) are observed and systematically investigated in solid lead and mercury halides MeX2 (Me = Pb, Hg and X = Cl, Br, I). In lead(II) halides, the most dramatic decrease of T-1 relative to that in a static sample is in PbI2, while it is smaller but still significant in PbBr2, and not detectable in PbCl2. The effect is magnetic-field dependent but independent of the spinning speed in the range 200-15 000 Hz. The observed relaxation enhancement is explained by laboratory-frame heteronuclear polarization exchange due to crossing between energy levels of spin-1/2 metal nuclei and adjacent quadrupolar-spin halogen nuclei. The enhancement effect is also present in lead-containing organometal halide perovskites. Our results demonstrate that in affected samples, it is the relaxation data recorded under non-spinning conditions that characterize the local properties at the metal sites. A practical advantage of fast relaxation at slow MAS is that spectral shapes with orientational chemical shift anisotropy information well retained can be acquired within a shorter experimental time. Published by AIP Publishing.

Place, publisher, year, edition, pages
American Institute of Physics Inc. , 2016. Vol. 144, no 22, 224201
National Category
Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189932DOI: 10.1063/1.4953540ISI: 000378926100014PubMedID: 27306000ScopusID: 2-s2.0-84974681701OAI: oai:DiVA.org:kth-189932DiVA: diva2:950224
Note

QC 20160728

Available from: 2016-07-28 Created: 2016-07-25 Last updated: 2016-07-28Bibliographically approved

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Safdari, MajidFuro, IstvanDvinskikh, Sergey V.
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