Abstract
Chloroform (CHCl<sub>3</sub>) solutions of tris(8-quinolinolato) Al(III) (AlQ<sub>3</sub>), when excited at 395 nm, fluoresce at 520 nm. Addition of tris(8-quinolinolato) Fe(III) (FeQ<sub>3</sub>) to these solutions decreases the fluorescence: the ratio of the fluorescent intensity in the presence of FeQ<sub>3</sub>, to that in its absence, is exponentially related to [FeQ<sub>3</sub>] and independent of [AlQ<sub>3</sub>]. We hypothesized that the main cause of this effect was FeQ<sub>3</sub> absorption of the exciting and emitted radiations. The hypothesis was tested in two ways: first, by calculating fluorescence losses using FeQ<sub>3</sub> absorbance measured at 395 and 520 nm; and second, by measuring fluorescence losses when the AlQ<sub>3</sub> was in one optical cell, and the FeQ<sub>3</sub> in others, which were located in either the excitation or emission paths, or both. Comparison between all the results showed that they were not significantly different (P<sub>0.01</sub>), thus verifying the hypothesis.
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