Chemical Structure from Scientific Research

Structures of the piperazine-bridged (PBR-3) resorcinarene cages. Carbon, oxygen, nitrogen, and hydrogen atoms are illustrated by brown, red, blue, and white colors, respectively. The large blue ball represents an encapsulated xenon atom. Examples of129Xe chemical shift (δ) and potential energy (E) surfaces with respect to the equilibrium values of the encapsulated xenon are shown on the right.

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