The complexes [EuL1]3+ and [EuL2] function as luminescent pH sensors over an extended pH range; two distinguishable pH switching ranges are observed: the delayed europium emission is switched on in acidic solution, whereas the fluorescence emission spectra show a pronounced pH dependence only in alkaline media.
T. Gunnlaugsson, Chem. Commun., 1998, 511 DOI: 10.1039/A708342D
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