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Figure 6
1H–1H DQ/SQ CRAMPS NMR correlation spectra for (a) 2·BF4 and (b) 1·BF4 measured at a spinning frequency of 10 kHz and with four recoupling loops. The short-range intramolecular 1H–1H correlation signals, e.g. between atoms H9 and H3, H6 or H5, are represented by blue labels 3×9, 6×9 or 5×9, respectively. The medium- and long-range intermolecular 1H–1H autocorrelation signals involving, for example, the aromatic atoms H2, H3, H5 and H6 are shown as red dots and labelled 2×2, 3×3, 5×5 and 6×6, respectively.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 2| April 2025| Pages 321-332
https://doi.org/10.1107/S1600576724012378
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