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Absorbance of (a) NaIR783 and [P66614][IR783] (c) NaIR820 and [P66614][IR820] in water and ethanol at a concentration of 5 μM. Fluorescence emission of (b) NaIR783 and [P66614][IR783] at 783 nm excitation wavelength (d) NaIR820 and [P66614][IR820] at 820 nm excitation wavelength in water and ethanol at a concentration of 5 μM.
