What Are the Relative Intensities of the Components of NMR Spectral Multiplets from Quadrupolar Nuclei in Uniformly Anisotropic Media?

Figure 6

Simulated NMR spectrum of a solute containing the quadrupolar nucleus ²³Na (I = 3/2) dissolved in an anisotropic environment, such as a stretched hydrogel. The splitting between the peaks can be controlled and is a function of the anisotropy, i.e., the extent of stretching the hydrogel. In this case, the splitting between the peaks is 180 Hz, which corresponds to a residual quadrupolar coupling (RQC) constant of  = 180 Hz. The ratio of the relative peak intensities is 3 : 4 : 3. The NMR spectrum was simulated by using SpinDynamica [39]. Lorentzian line broadening (full-width at half-maximum height = 40 Hz) was used in the simulation.