*3.3. Mass Spectrometry*

The nature of the inclusion complexes between Q[7] and the 4-pyrrolidinopyridinium guests was also established by the use of MALTI-TOF mass spectra, as shown in Figure 6. Intense signals were found at 1311.080, 1339.624, 1367.817, 1395.699, 1423.788, and 1479.762, which corresponded to [(Q[7]@C0)–Cl–]+ (calculated as 1312.196), [(Q[7]@C2)–Br–]+ (calculated as 1340.250), [(Q[7]@C4)–Br–]+ (calculated as 1368.304) and [(Q[7]@C6)–Br–]+ (calculated as 1396.358), respectively, thereby providing support for the formation of 1:1 host–guest inclusion complexes.

**Figure 6.** MALDI-TOF mass spectrometry of Q[7]@C0 (**A**), Q[7]@C2 (**B**), Q[7]@C4 (**C**), and Q[7]@C6 (**D**).
