Abstract
The 2D NMR COSY and DQF-COSY spectra of an AX system of spins I = 3/2 have been calculated by numerical density matrix calculations. The results are presented in two extreme cases, namely in the slow relaxation regime and in the fast relaxation regime. It is concluded that in addition to the usual advantages that the DQF-COSY NMR experiment offer compared with the conventional COSY NMR experiment (observation of only-coupled spins, antiphase character of both diagonal and cross-peaks and intensity of the cross peaks comparable to the intensity of the diagonal peaks), the DQF-COSY NMR experiment appear to be more reliable for interpretation and analysis than the conventional COSY NMR experiment and this is particularly true for quadrupolar nuclei relaxing usually very quickly. © 2011 Wiley Periodicals, Inc. Concepts Magn Reson Part A 38A: 7–15, 2011.
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