Supphachok ChanmungkalakulVuthichai ErvithayasupornSasikarn HanprasitManlika MasikNicha PrigyaiSuda KiatkamjornwongMahidol UniversityChulalongkorn UniversityRoyal Institute of Thailand2018-12-212019-03-142018-12-212019-03-142017-01-01Chemical Communications. Vol.53, No.89 (2017), 12108-121111364548X135973452-s2.0-85033229177https://repository.li.mahidol.ac.th/handle/20.500.14594/42157© 2017 The Royal Society of Chemistry. Pyrene functionalized silsesquioxane cages (PySQ) not only provide significant fluorescence from pyrene-pyrene excimers with a very large Stokes shift (Δλ = 143 nm, 69 930 cm-1) in DMSO but also exhibit fluoride capture results coincidentally with a π-π∗ fluorescence enhancement. On the other hand, PySQ-F- in THF significantly exhibits π-π∗ fluorescence quenching and a color change can be observed with the naked eye from light yellow to deep orange by forming a charge-transfer (CT) complex among the pyrenyl rings. Moreover, PySQ selectively captures F- with a response time of <2 min and with a very low detection limit (1.61 ppb), while 19F NMR is used to confirm encapsulation of F- with Δδ = 19 ppm.Mahidol UniversityChemical EngineeringChemistryArticleSCOPUS10.1039/c7cc06647c