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Measuring 19F shift anisotropies and 1H–19F dipolar interactions with ultrafast MAS NMR

Martini, Francesca; Miah, Habeeba K.; Iuga, Dinu; Geppi, Marco; Titman, Jeremy J.

Authors

Francesca Martini

Habeeba K. Miah

Dinu Iuga

Marco Geppi



Abstract

A new 19F anisotropic–isotropic shift correlation experiment is described that operates with ultrafast MAS, resulting in good resolution of isotropic 19F shifts in the detection dimension. The new experiment makes use of a recoupling sequence designed using symmetry principles that reintroduces the 19F chemical shift anisotropy in the indirect dimension. The situations in which the new experiment is appropriate are discussed, and the 19F shift anisotropy parameters in poly(difluoroethylene) (PVDF) are measured. In addition, similar recoupling sequences are shown to be effective for measuring 1H–19F distances via the heteronuclear dipolar interaction. This is demonstrated by application to a recently synthesized zirconium phosphonate material that contains one-dimensional chains linked by H–F hydrogen bonds.

Journal Article Type Article
Publication Date Oct 1, 2015
Journal Journal of Magnetic Resonance
Print ISSN 1090-7807
Electronic ISSN 1090-7807
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 259
APA6 Citation Martini, F., Miah, H. K., Iuga, D., Geppi, M., & Titman, J. J. (2015). Measuring 19F shift anisotropies and 1H–19F dipolar interactions with ultrafast MAS NMR. Journal of Magnetic Resonance, 259, doi:10.1016/j.jmr.2015.08.004
DOI https://doi.org/10.1016/j.jmr.2015.08.004
Keywords Chemical shift anisotropy; Ultrafast magic angle spinning; Anisotropic–isotropic shift correlation; Symmetry-based recoupling sequence; Heteronuclear dipolar coupling; Dipole-shift correlation
Publisher URL http://www.sciencedirect.com/science/article/pii/S109078071500169X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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