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(A) Representative, normalized fluorescence emission spectra of 1 μM N1-(anthracen-9-ylmethyl)ethane-1,2-diaminium dichloride 2 in the presence and absence of 400 mM NaF, KF, NaCl, KCl, NaBr, KBr, NaI, or KI (10 mM sodium phosphate buffer pH 7.0; no DNA). The spectra were recorded from 380 to 550 nm using an excitation wavelength of 366 nm. (B) Normalized fluorescence at the Emmax of the anthracene (416.5 ± 0.5 nm) averaged over three trials. Error bars represent standard deviation.
