5 years ago

Encapsulation of Isolated Luminophores within Supramolecular Cages

Encapsulation of Isolated Luminophores within Supramolecular Cages
Michael D. Ward, Chunhua Hu, Marcel Handke, Takuji Adachi
The sequestration of luminophores within supramolecular polyhedral compartments of a crystalline zeolite-like hydrogen-bonded framework illustrates a unique approach to limiting the self-quenching ordinarily exhibited at the high concentrations achievable in this framework. A range of differently sized luminescent guests, namely coumarin 1, coumarin 4, fluorescein, [Ru(bpy)3]Cl2, and rhodamine B, can be encapsulated in amounts of up to one molecule per cage, equivalent to a concentration of 0.175 m, which is significantly higher than the concentration at which aggregation-induced quenching occurs in other media. The luminescence spectra of the encapsulated guests are consistent with the presence of isolated monomers and the absence of self-quenching. The emission color of the single crystals can be tuned readily from blue to red through the choice of guest molecules. These observations promise an approach to organic solid-state lasing compounds if crystals of sufficient size and quality can be prepared. The supramolecular cages of a zeolite-like framework were used to encapsulate and isolate molecular luminophores with a range of sizes and emission wavelengths. The luminescence spectra of these host–guest systems were consistent with the presence of isolated monomers and the absence of self-quenching.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707097

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