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Fig. 1. Structures and optical properties of TO-PRO-3 iodide and DiOC2(3). (A) Chemical structures of TO-PRO-3 iodide and DiOC2(3). (B) Absorbance spectra of TO-PRO-3 iodide (■) and DiOC2(3) ((3) (●) showing the distinct absorbance spectra of the two dyes. (C) Absorbance spectra of DiOC) showing the distinct absorbance spectra of the two dyes. (C) Absorbance spectra of DiOC2(3) (■) with corresponding emission spectra at λex = 450 nm ( = 450 nm (●). (D) Absorbance spectra of TO-PRO-3 iodide (■) with corresponding emission spectra at ). (D) Absorbance spectra of TO-PRO-3 iodide (■) with corresponding emission spectra at λex = 600 nm ( = 600 nm (●).).