(B) Fluorescent spectra for 0.5 mM Phen (red),
0.5 mM Phen + 0.25 mM Cd(Ac)2 (blue),
and 0.5 mM Phen + 0.25 mM Cd(Ac)2 + 0.25 mM Na2S (black).
The intensities were record under
normalized concentration with the excitation wavelength of 260 nm. (For interpretation
of the references to color in this figure legend, the reader is referred to the
web version of this article.)