Regensburg 2004 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 9: Single Molecule Spectroscopy

CPP 9.4: Talk

Monday, March 8, 2004, 14:45–15:00, H 38

Orientation of Single Molecules in Nanostructured Molecular Sieves — •Christian Hellriegel, Christian Seebacher, Christophe Jung, and Christoph Bräuchle — LMU München, Dept. Chemie, Butenandtstr. 11, 81377 München

Revealing heterogeneities and measuring the distribution of a physical property of a system is a major advantage of single molecule spectroscopy (SMS) compared to conventional ensemble methods. Recently we have shown that single fluorescent dye molecules can also be detected if the molecules are incorporated as guests in inorganic molecular sieves. Furthermore, it is possible to obtain the molecule’s emission spectrum and to determine its orientation using a confocal setup.

In the presented study we examine the influence of molecular size on the orientational distribution: Three differently sized Oxazine dye molecules have been incorporated during synthesis into AlPO₄-5 crystals (unidimensional channels, pore diameter 760pm). By analysing the orientation of many individual molecules with respect to the channel axis, we determine the effect of the molecular size on the orientational distribution, and to which extent the host’s structure influences the alignment of the molecules. During the measurements we also observe spectral dynamic events, and in rare cases orientational jumps.