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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Poster: Polymer Dynamics

CPP 31.15: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Group-specific Motion of Single Perylene Bisimide Molecules at Interfaces — •Danny Kowerko¹, Stefan Krause¹, Richard Börner², and Christian von Borczyskowski¹ — ¹Center of nanostructured materials and analytics, TU-Chemnitz, 09107 Chemnitz — ²Institut für Physik, Universität zu Lübeck 23538 Lübeck, Ratzeburger Allee 160

The motion of single organic molecules is often used as probe for the dynamics in heterogeneous media like polymers. Therefore rotational and conformational fluctuations are analysed with single molecules spectroscopy techniques, providing information on the mobility of the local environment of the molecule. Restricted mobility of the molecule itself can be enforced by functional groups. Here we demonstrate on a single molecule level how perylene bisimide molecular (conformational and rotational) dynamics are changed upon adsorption to SiO2 or quartz glass surfaces. A recently developed multi-parameter single molecule detection set-up allowing for rapid parallel determination of 3-D orientation, spectrum and lifetime is used to demonstrate (pyridyl) group-specific adsorption of PBI to the surfaces and how this fact restricts conformation and orientation dynamics.