Abstract: Absorbance and steady-state and time-resolved fluorescence measurements were employed to examine the mechanism (s) of excited singlet state quenching by nitroxides in a series of nitroxidefluorophore adducts. This work establishes the following:(1) the absorption and emission energies of the fluorophores are unaffected by the presence of the nitroxide substituent (s), and the residual emission that is observed from the adducts arises from the ...
