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Figure 5
(a) 13C{19F} CP/MAS NMR spectra of crystalline 2·BF4 measured at two different cross-polarization mixing times. (b) 19F–13C cross-polarization build-up curves created for atoms C1, C4, C7 and C8. (c) A typical 11B–11B DQC build-up recorded for 2·BF4. (d) The dependence between the recoupling time at maximum DQ coherence intensity tm and the interatomic 11B⋯11B distance r. The relation r = [0.23 t_{\rm m}^{0.38}], where r represents the 11B⋯11B interatomic distance and tm is the recoupling time to reach maximum signal intensity, was derived previously by fitting the tm recoupling times experimentally determined for crystalline compounds with known B⋯B interatomic dissonances such as CsCoD, borax, H3BO3 or 2-methyl­propyl­boronic acid (Brus et al., 2017BB17; Hušák et al., 2018BB41).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 2| April 2025|
https://doi.org/10.1107/S1600576724012378
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