HEED HETCOR

An example showing the relative advantages of 2D correlations measured by HEED-HETCOR and phase-sensitive HEED-HETCOR is given in Figure 46. 

Any HETCOR pulse sequence can readily be extended by a Hahn-echo pulse train [20] which is particularly useful in the case of Sn/ H HEED-HETCOR of tin-nitrogen compounds. This enables one to measure y( Sn, N), /( N, H) (together with the relative signs) and A / N( Sn), all at the same time (see Figure 13). Numerous other modifications of 2D HETCOR experiments are feasible, many of which are based on schemes of selective excitation and/or... 

Figure 13 Contour plot of the 111.9 MHz " n/ H HEED-HETCOR experiment of l,l-dimethyl-2,2-bis(trimeth stannyl)hydrazine (2S°C 2S% in Hahn-ccho...

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