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The inclusion complex of Rhodamin B (Rh B) with (N-6-deoxy-β-cyclodextrin-6-yl-1-aminocarbonyl)-3-(4-fluorobenzoyl)-7-pyridin-4-yl indolizine [designated as compound (1)] is shown to be a potential pH sensor based on fluorescence resonance energy transfer (FRET). By steady state and time-resolved fluorimetry it has been established that (i) an excited state proton transfer (ESPT) occurs between the...
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