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The alkyne‐functionalized MSNs MCM‐41 are loaded (A→B) with rhodamine B (RhB) molecules, and capped (A→B) with CB[6] during the CB[6]‐catalyzed alkyne‐azide 1,3‐dipolar cycloadditions. RhB molecules are released (B→C) by switching off the ion-dipole interactions between the CB[6] rings and the bisammonium stalks by raising the pH and deprotonating the amines. Reprinted with permission from 23, copyright (2008) Angew. Chemie - Int. Ed.
