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Reduced Fluorescence from Tris-(8-quinolinolato) Aluminum(III) in the Presence of Its Fe(III) Analog

Volume 33, Number 3 (June 1979) Page 298-300

Milham, Paul J.; Hudson, Alun W.; Maguire, Michael J.; Haddad, Kamel S.; Short, Colin C.

Chloroform (CHCl3) solutions of tris(8-quinolinolato) Al(III) (AlQ3), when excited at 395 nm, fluoresce at 520 nm. Addition of tris(8-quinolinolato) Fe(III) (FeQ3) to these solutions decreases the fluorescence: the ratio of the fluorescent intensity in the presence of FeQ3, to that in its absence, is exponentially related to [FeQ3] and independent of [AlQ3]. We hypothesized that the main cause of this effect was FeQ3 absorption of the exciting and emitted radiations. The hypothesis was tested in two ways: first, by calculating fluorescence losses using FeQ3 absorbance measured at 395 and 520 nm; and second, by measuring fluorescence losses when the AlQ3 was in one optical cell, and the FeQ3 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 (P0.01), thus verifying the hypothesis.