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NMR longitudinal relaxation enhancement in metal halides by heteronuclear polarization exchange during magic-angle spinning
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0002-0231-3970
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0002-6524-1441
2016 (engelsk)Inngår i: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 144, nr 22, artikkel-id 224201Artikkel i tidsskrift (Fagfellevurdert) Published
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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.

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American Institute of Physics Inc. , 2016. Vol. 144, nr 22, artikkel-id 224201
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URN: urn:nbn:se:kth:diva-189932DOI: 10.1063/1.4953540ISI: 000378926100014PubMedID: 27306000Scopus ID: 2-s2.0-84974681701OAI: oai:DiVA.org:kth-189932DiVA, id: diva2:950224
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QC 20160728

Tilgjengelig fra: 2016-07-28 Laget: 2016-07-25 Sist oppdatert: 2017-11-28bibliografisk kontrollert

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