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Contrasting binding ability of two isostructural FeII4L6 tetrahedra. (a) Cage 111 binds only small inorganic anions in acetonitrile but not larger anions or neutral organic molecules.159 (b) Analogous cage 27 binds a wide variety of neutral organic molecules, some gases, and P4 in water.160−165 (c–g) X-ray crystal structures of selected host–guest complexes of each cage are depicted.
