Regensburg 2004 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 16: POSTER: Computational Physics, Complex Systems
CPP 16.10: Poster
Tuesday, March 9, 2004, 17:00–19:00, B
Single Molecule Spectroscopy of Supramolecular Dye Assemblies — •Erwin Lang1, Rainer Dobrawa2, Armin Sautter2, Frank Würthner2, and Jürgen Köhler1 — 1Experimental Physics IV, University of Bayreuth — 2Institute for Organic Chemistry, University of Würzburg
Self-assembly processes of atoms and small molecules lead to supramolecular structures with unbelievable variety and complex functionality. One of the most intriguing examples in nature is the light-harvesting system of purple bacteria, where bacteriochlorophyll dyes are arranged in concentric rings by non-covalent interactions within a self-assembled protein scaffold. As a model system for self-assembly processes we study four pyridine-substituted perylene bisimide dyes and four cis-Pt(II) metal centres, which form supramolecular squares by metal-ion-directed coordination of the dye molecules.
In order to suppress inhomogenous line-broadening effects and to characterize the mutual interactions between the subunits we apply single-molecule spectroscopic techniques. We present fluorescence-excitation spectra of individual perylene bisimide dyes and preliminary studies of individual multichromophoric perylene bisimide assemblies at low temperatures.