Host-Guest Complexations of Amine Boranes and Isoelectronic/Isostructural Quaternary Alkylammonium Cations by Cucurbit[7]uril in Aqueous Solution

Figure 4

¹H NMR titration of morpholine borane (1.0 mM) with (a) 0.00, (b) 0.16, (c) 0.30, (d) 0.44, (e) 0.62, (f) 0.83, (g) 1.17, (h) 2.24, and (i) 3.13 equivalents of CB in D₂O (pD = 4.75).