Freed at the flick of a photoswitch: An acyl hydrazone forms supramolecular assemblies upon the binding of specific salts, such as potassium thiocyanate. This process presents cation and anion selectivity as well as thermo- and photoreversibility (see scheme). In particular, the system displays photorelease of potassium cations and undergoes dynamic component exchange in the acyl hydrazone.
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