Scheme 4. Irradiation of a mixture of cage 5 (10 μM), NaCl (60 μM), and the photoacid PAH (8 equiv. with respect to each bipyridyl ligand) in CD₃CN/D₂O (8 : 2) by violet light results in disassembly of the cage and liberation of the [B(p-C₆H₄F)₄]^– guest (green ball) as evidenced by the ¹H NMR (left) and ¹⁹F NMR spectra (right). Details about the bridging ligand (yellow) are given in the ESI.† .