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Luminescence properties of a cofacial dipalladium porphyrin dimer under argon and in the presence of dioxygen

✍ Scribed by Frédéric Bolze; Claude P. Gros; Pierre D. Harvey; Roger Guilard

Book ID: 102399771
Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 108 KB
Volume: 05
Category: Article
ISSN: 1088-4246
DOI: 10.1002/jpp.362

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✦ Synopsis

The preparation and luminescence properties of a dipalladium cofacial porphyrin dimer (DPA) Pd ~2~ (where DPA is the tetraanion of 1,8-bis(2,8,13,17-tetraethyl-3,7,12,18-tetramethylporphyrin-5-yl)anthracene) are reported and compared together with the photophysical behavior of the known monomeric (OEP)Pd and (TPP)Pd complexes. The effect of dioxygen in the presence and in the absence of the very bulky base, 1-t-butyl-5-phenylimidazole, is also investigated. The title dimer, (DPA) Pd ~2~, shows fluorescence and phosphorescence in the ps and ms time scale, respectively, with a global intensity lower than that of the porphyrin monomer analogues. The fluorescence sensitivity towards dioxygen quenching appears greater for the dipalladium complex than that of the monoporphyrin derivatives. In the presence of the bulky base, this sensitivity shows a dramatic decrease.

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