An adaptable Fe(II) tetrahedral cage, [Fe 4 L 4 ][BF 4 ] 8 (L= tris (4‐(((E)‐pyridin‐2‐ylmethylene)amino)phenyl) phosphate), has been synthesised via self‐assembly. By modulating the orientation of its pendant P=O groups, the cage was found to be capable of encapsulating anionic, neutral, and cationic guests, which were confirmed in the solid state via single‐crystal X‐ray diffraction (SCXRD) and in solution by high‐resolution mass spectroscopy (HR‐MS), as well as by NMR ( 1 H, 19 F, 31 P) studies where possible.
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Ward et al. (2024) studied this question.
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