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

Figure 3

¹H NMR titration of trimethylamine borane (1.0 mM) with (a) 0.00, (b) 0.17, (c) 0.50, (d) 0.67, (e) 0.83, and (f) 1.25 equivalents of CB in D₂O. B-H proton resonance shown expanded.