Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: POSTERS Nanoparticles
CPP 14.3: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Photophysical studies of zinc porphyrin oligomers — •Jȩdrzej Szmytkowski1,2, Jonas Conradt1, Wolfgang Löffler1, Teodor Silviu Balaban2,3, Matthieu Koepf4, Jennifer Wytko4, Jean Weiss4, and Heinz Kalt1,2 — 1Karlsruhe Institute of Technology (KIT), Universität Karlsruhe (TH), Institute of Applied Physics, Karlsruhe, Germany — 2Center for Functional Nanostructures (CFN), Karlsruhe, Germany — 3Karlsruhe Institute of Technology (KIT), Forschungszentrum Karlsruhe, Institute for Nanotechnology, Karlsruhe, Germany — 4Institut de Chimie, UMR 7177, Université Louis Pasteur, Strasbourg, France
The fabrication of novel multiporphyrinic arrays is important for the progress of molecular electronics and to mimic self-assembling chromophores in artificial light harvesting devices. We report on the time resolved photoluminescence studies of two novel phenanthroline strapped Zn–porphyrins having an imidazole pendant arm and C12 or C18 alkyl chains. The luminescence dynamics have been analyzed using decay associated spectra (DAS). The obtained results show the formation of well-ordered J–aggregates. Such self-assembled species have been recently directly observed for these porphyrins deposited on the mica surface by various nanoscopic techniques. No evidence of energy transfer from the phenanthroline strap to the zinc porphyrin has been found, a fact which can be explained by unfavourable Förster– and Dexter–type energy transfer processes.