Figure 3.

¹H NMR spectra of a) Np14CMe₂, c) Ant910H, and b) their equimolar mixture with two equivalents of CB[8], which displays a proximal stacking between the isopropyl moiety of Np14CMe₂ and the phenyl group of Ant910H demonstrated by 2D NOESY NMR at 278 K (d). All protons are unambigiously assigned through 2D COSY and NOESY NMR (see Figures S16 and S17). e) Complex ion peaks with four charges (z=4) and a m/z centered around 916 in the ESI‐MS confirm the formation of [Np14CMe₂⋅Ant910H⋅CB[8]₂]⁴⁺ heterodimer. The Cl⁻ counterions are omitted for clarity.