Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: POSTERS Nanoparticles

CPP 14.3: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Photophysical studies of zinc porphyrin oligomers — •Jȩdrzej Szmytkowski^1,2, Jonas Conradt¹, Wolfgang Löffler¹, Teodor Silviu Balaban^2,3, Matthieu Koepf⁴, Jennifer Wytko⁴, Jean Weiss⁴, and Heinz Kalt^1,2 — 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.