Selective scalar-spin decoupling

Two papers by Riek and co-workers ° have been devoted to a technique based on a spin-state selective olT-resonance decoupling which allows monitoring the chemical shift in multidimensional NMR. Moreover, the authors indicate that it also facilitates the accurate measurement of the residual scalar coupling. ... 

First, the soft s ment carbons of all Hytrel samples can be observed selectively using scalar decoupling (Figure 2). This indicates that the carbons in the mobde r ons have dynamic properties which are different than those of the ripd carbons. In addition, the T data indicate that the rate of these motions is independent of the hard s ment content of the polymer. If considerable mixed phase were present, one would expect that the number of spins observable with scalar decoupling would be a function of the average hard block length of the polymer. 

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