Paper Emission quenching of photoactive molecules embedded in supramolecular solids: Synthesis, structure and photoluminescence studies of benzil in a CMCR-based inclusion complex with a saturated linker molecule{

Using a fully saturated linker, DPP [DPP ~ 1,3-di-(4-piperidyl)propane], a new CMCR-based (CMCR ~ C-methylcalix[4]resorcinarene) supramolecular complex incorporating benzil, CMCR-DPP-benzilEtOH-H2O, and a corresponding benzil-free analogue CMCR-DPP-3EtOH, have been synthesized. Comparison of the TDDFT energy levels and the experimental host-absorption and guest-emission spectra, confirms that the emission quenching of benzil in a series of CMCR-linker frameworks can be attributed to the energy transfer from the guest to the host framework in the supramolecular solid and suggests strategies for increasing the lifetime of luminescent materials.