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INTERNATIONAL JOURNAL OF SPECTROSCOPY
Volume -, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2014/289638
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Of the various problems in decoupling one nucleus type from another using standard decoupling pulse schemes for broadband decoupling, a particular challenge is to effect full, artifact-free decoupling when the size of the coupling constant is very large. Herein it is demonstrated that H-1 decoupling of the P-31 NMR spectrum of diethyl phosphonate {HP(=O)(OCH2CH3)(2)} can be accomplished with reduced artifacts despite the large (1)J(H,P) value of 693 Hz by using a combination of decoupling pulse schemes involving continuous-wave (CW) irradiation and either adiabatic-pulse decoupling (APD), MPF decoupling, or traditional composite-pulse decoupling (CPD) schemes such as WALTZ or GARP. The considered strategy is simple, efficient, and easy to implement on most instruments. The best result was attained for a combination of CW and CPD using GARP with a standard pulse width of 60 mu s. Altogether, the advantages of the methodology include low power requirements, complete decoupling, tolerance of a range of large J values, large bandwidth for normal-sized J values, and the suppression of sidebands.
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