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

Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1, Canada

Université de Bourgogne, LIMSAG (Laboratoire d'Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, UMR 5633), Faculté des Sciences Gabriel, 6, boulevard Gabriel, 21100-Dijon, France

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CLAUDE P. GROS

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PIERRE D. HARVEY

Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1, Canada

Corresponding author, Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.

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, and

ROGER GUILARD

Corresponding author, Université de Bourgogne, LIMSAG (Laboratoire d'Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, UMR 5633), Faculté des Sciences Gabriel, 6, boulevard Gabriel, 21100-Dijon, France.

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https://doi.org/10.1002/jpp.362Cited by:29 (Source: Crossref)

Abstract

The preparation and luminescence properties of a dipalladium cofacial porphyrin dimer (DPA)Pd₂ (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)Pd₂, 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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