Figure 5.

Chemical shift difference between free and encapsulated Bu₃PO observed by ³¹P NMR at two concentrations, 3.50 mM (black) and 24.00 mM (red) in the presence of ^C11R₆ (5.38 mM). Spectra were obtained at water contents spanning 43.76–110.19 mM (3.50 mM Bu₃PO) and 43.05–86.53 mM (24.00 mM Bu₃PO), which were subsequently converted to the proportion of ^C11R₆-B (θ_B) by an empirical model (Figure S13). Inset, a ³¹P NMR spectrum showing peaks corresponding to encapsulated (▼, green) and free (■, blue) Bu₃PO.