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

Figure 8

Simulated NMR spectrum of a solute containing the quadrupolar nucleus ¹³³Cs (I = 7/2) 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 60 Hz, which corresponds to a residual quadrupolar coupling (RQC) constant of  = 60 Hz. The ratio of the relative peak intensities is 7 : 12 : 15 : 16 : 15 : 12 : 7. The NMR spectrum was simulated by using SpinDynamica [39]. Lorentzian line broadening (full-width at half-maximum = 40 Hz) was used in the simulation.