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The following abbreviations are used: TNM, tetranitromethane; to 340-nm region, and a half-titration of the dimethylamino groups occurs at approximately pH 3.0. The fluorescence excitation spectra coincide with the absorption spectra at wavelengths above 320 nm, but the excitation extinction is considerably lower at shorter wavelengths. Both the fluorescence excitation and emission spectra are sensitive to solvent