A New Strategy to Construct Functional Porous Crystals by Mixed Crystallization through Charge-transfer Interactions

An organic salt composed of triphenylmethylamine (TPMA) and 2-(4-sulfophenyl)anthraquinone (2-SPAQ) provides a porous crystal with 1D channel void spaces surrounded by anthraquinone. We succeeded in introducing fluorescence property into the porous crystal by mixed crystallization with a different salt composed of TPMA and 2-(4-sulfophenyl)anthracene (2-SPA) through charge-transfer (CT) interactions. As a result, the porous CT complex crystals showed a unique vapochromism for various volatile solvents.