Abstract
Fluorescence decay of 4-methoxy-N-[2-(1-pyrrolidin)ethyl]-1,8-naphthalimide] in water solution is analyzed. At pH values around 10, a double exponential decay function is observed. When pH > 10 or pH < 9, a single exponential function only is observed. This feature is due to a protonation equilibrium in the ground state. The pK value for this equilibrium is reported. This behavior has been interpreted on the basis of a photoinduced charge transfer with fluorescence quenching. An estimated value for the rate constant in this process is calculated.
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