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Fluorescent emission of probe 1 (10.7 nM) (a), probe 2 (11.0 nM) (b) and probe 3 (12.5 nM) (c) in acetonitrile (red line), acetonitrile–phosphate buffer 1 mM pH 7.2 1 : 1 (black line), acetonitrile–H2O 1 : 1 (dark blue line), acetonitrile–H2O 8 : 2 (blue line) and tetrahydrofuran (2.5 nM, green line).
