Regensburg 2004 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 9: Single Molecule Spectroscopy

CPP 9.3: Talk

Monday, March 8, 2004, 14:30–14:45, H 38

Single Molecule Diffusion in Nanostructured Molecular Sieves — •Johanna Kirstein¹, Christian Hellriegel¹, Christoph Bräuchle¹, Peter Behrens², Nikolay Petkov¹, and Thomas Bein¹ — ¹LMU München, Dept. Chemie, Butenandtstr. 11, 81377 München — ²Universität Hannover, Callinstr. 9, 30167 Hannover

Single molecule spectroscopy (SMS) is used to characterise diffusion in nanometre sized structures. Here we show the diffusion of single TDI molecules incorporated as guests into the pores of a M41S-host using single particle tracking (SPT). A major advantage of SPT compared to e.g. FCS is the possibility to obtain the trajectory of a fluorescent dye molecule.

This has been demonstrated recently for TDI molecules diffusing in monoliths of M41S using confocal microscopy. New studies in similar, spincoated samples using wide field imaging provide an improved temporal resolution. X-Ray diffraction measurements will point out the existence of a hexagonal or cubic order of the pores in an otherwise amorphous solid body. With SPT we obtain structured trajectories, which reflect the tortuosity of the channels. These trajectories help to understand better the channel structure of the hosts and the influence of the pores on the diffusional behaviour of the guest molecules.