Figure 1.

Electrospray ionization mass spectrometry (ESI–MS) analysis following the anion exchange of (a) a control sample of circular pentameric helicates from route A, where amines 4 and 7 were mixed prior to addition to the reaction mixture and (b) circular pentahelicates from route B, where amines 4 and 7 were reacted separately with aldehyde 1 to generate helicates 2 and 6 which were subsequently mixed and heated for 4 days at 60 °C. Peaks corresponding to helicates bearing n hexylamine residues and (10 – n) 2-methoxyethyl amine residues (for n = 0–10) with varying numbers of PF₆^– counterions.