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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Electronic and Optical Properties of Organic Systems

CPP 12.5: Poster

Monday, March 22, 2010, 16:30–18:00, Poster C

Enwrapping of tubular J-aggregates using dye-labeled polyelectrolytes — •Omar Al-Khatib^1,2, Helmuth Möhwald¹, Jürgen P. Rabe², Christoph Böttcher³, and Stefan Kirstein² — ¹Max-Planck-Insitute of Colloids and Interfaces, Potsdam, Germany — ²Humboldt University Berlin, Department of Physics, Germany — ³Freie Universität Berlin, Researchcenter for Electron Microscopy, Germany

In this contribution we demonstrate the coating of tubular J-aggregates with dye-labeled polyelctrolytes. The tubular J-aggregates are formed by an amphiphilic cyanine dye in aqueous solutions [1]. Due to the amphiphilic character of the molecules their aggregates possess a negatively charged surface, which can be utilized for the adsorption of oppositely charged polyelectrolytes. Poly(diallyldimethylammonium chloride) (PDAC)and poly(allylamine hydrochloride) (PAH) labeled with different fluorescent dyes may act as donors or acceptors within a Förster energy transfer (FRET) process.

The enwrapping is verified by cryogenic transmission electron microscopy (cryo-TEM). The FRET is investigated by means of optical absorption and fluorescence spectroscopy. These experiments provide evidence for energy transfer between the aggregate and the dye-labeled polyelectrolyte shell.

[1] S.Kirstein, S. Dähne, International Journal of Photoenergy, Volume 2006, Article ID 20363, 1-21