Figure 5: Selective formation and characterization of a heteroleptic complex.

(a) Schematic representation of the selective formation of heteroleptic host-guest-guest’ complex (4a/(4b)2)@2b and (b) its optimized structure (the peripheral substituents are replaced by hydrogen atoms). (c) 1H NMR (500 MHz, 100:1 D2O/CD3CN, room temperature) and (d) ESI-TOF MS (H2O/CH3CN) spectra of (4a/(4b)2)@2b.