For alkanoate ligands on NCs, the C spectra resolve three major segments/units (Figure ): the CH3 group (15 ppm), the CH2 unit next to CH3 (25 ppm), and the middle (CH2)n units (in the range of 26 -40 ppm). The DIPSHIFT curves of these segments/units are plotted in Figure . The overall shapes of the curves suggest that the mobility of chain units is in the fast motion limit but with anisotropic characteristics. The results show that the outer CH3 and CH2 units are more flexible than the middle (CH2)n units. In each of these figures, we also compare the curves for the ligands of different lengths (i.e., C14, C16, C18 and C22) on pure-ligand NCs. The comparison asserts the fact that the longer ligands possess less flexibility. More importantly, the values of residual dipolar coupling in these DIPSHIFT curves have been obtained for quantitative calibrations of motional amplitude.