Fig. 3: 31P MAS NMR double-quantum single-quantum correlation spectra MAS NMR spectra of GTUB5. | Nature Communications

Fig. 3: 31P MAS NMR double-quantum single-quantum correlation spectra MAS NMR spectra of GTUB5.

From: Polyphosphonate covalent organic frameworks

Fig. 3

After annealing at 220 °C (a) and after annealing at 270 °C (b). The phase-adapted PostC7 pulse sequence68,69  was used under a magnetic field of 7.04 T at a spinning frequency of νr = 14286 Hz (left) and 10 kHz (right), respectively. Double-quantum conversion periods for excitation and reconversion period were 1.4 ms (left) and 0.8 ms (right). The drawn diagonal corresponds to the hypothetical position of the signal of an isochronous spin-pair.

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