The Application of Simple and Easy to Implement Decoupling Pulse Scheme Combinations to Effect Decoupling of Large Values with Reduced Artifacts
Figure 2
The 31P NMR spectrum of HP(=O)(OCH2CH3)2 indicates the resultant sidebands with decoupling of 1H by (a) CPD decoupling using WALTZ (PW, 60 μs; PL, 10 dB; , 1.33 Hz; DB, 10 kHz; SDB, 5 kHz); (b) CPD decoupling using GARP (PW, 60 μs; PL, 9.4 dB; , 1.35 Hz; DB, 19 kHz; SDB, 7 kHz); (c) MPF decoupling (PW, 1 ms; PL, 11.3 dB; , 1.32 Hz; DB, 28 kHz; SDB, 7 kHz); (d) APD using CHIRP (PW, 1 ms; PL, 5.8 dB; , 1.47 Hz; DB, 44 kHz; SDB, 15 kHz); and (e) the same as (a) but with higher amplification to highlight the sidebands. The signal of a minor impurity (~3%) at 2.24 ppm is indicated with an asterisk. Note: all spectra within this figure, and similarly for spectra within the following figures, have been acquired with the same number of scans and receiver gain and processed in exactly the same way with identical line broadening and amplification unless explicitly stated otherwise. Legend: PW, pulse width (length); PL, power level; , linewidth (width at half-height); DB, decoupling bandwidth; and SDB, sideband decoupling bandwidth.
