A "Camel through the Eye of a Needle": Direct Introduction of the TPP+ Ion inside Y-Zeolites by Formal Ion Exchange in Aqueous Medium

Photocatalytic fillings for cavities: A very simple, yet highly efficient method to introduce triphenylpyrylium (TPP) ions into Y‐zeolite cavities has been found (see picture). It consists of simply stirring the non‐activated NaY‐zeolite with an aqueous solution of triphenylpyrylium hydrogen sulfate at 40 °C, before drying the doped support. The FTIR and elemental analyses of the product (TPP‐Y), as well as the repeated and reproducible photocatalytic reactivity of the TPP‐Y confirm the presence of the TPP+ electron acceptor inside the cavities of the support.