Strong Cation···π Interactions Promote the Capture of Metal Ions within Metal-Seamed Nanocapsule

Thallium
ions are transported to the interior of gallium-seamed
pyrogallol[4]­arene nanocapsules. In comparison to the capture of Cs
ions, the extent of which depends on the type and position of the
anion employed in the cesium salt, the enhanced strength of Tl···π
vs Cs···π interactions facilitates permanent
entrapment of Tl+ ions on the capsule interior. “Stitching-up”
the capsule seam with a tertiary metal (Zn, Rb, or K) affords new
trimetallic nanocapsules in solid state.