Neighbor tables, molecular dynamics

With a few exceptions such as (I = 1), which has a small nuclear quadmpole moment, the nonspherical charge distribution of nuclei with a spin number I a 1 have a large electric quadmpole moment that affects the relaxation time, and the width of their NMR signals are broad. These broad lines usually mask the ability to measure useful NMR parameters such as chemical shifts and coupling with neighboring nuclei. As a result, they are not discussed here, as most of the solution NMR studies of polymers were performed on J = 1/2 nuclei. In the solid state, quad-rapolar interactions from measurements of NMR can yield valuable molecular stmcture and dynamics information this is discussed in Chapter 2.07. Some of the NMR characteristics of commonly observed nuclei are summarized in Table 1. 

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