Düsseldorf 2007 – scientific programme

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MO: Fachverband Molekülphysik

MO 56: Poster: Femtosecond Spectroscopy

MO 56.5: Poster

Thursday, March 22, 2007, 16:30–18:30, Poster A

Molecular Dynamics of Pigment Molecules in Mesoporous Materials: Femtosecond Studies — •Khadga Karki, Juncheng Hu, Ryan Richards, and Arnulf Materny — International University Bremen (Jacobs University Bremen as of spring 2007), Germany

Silica-based mesoporous materials like SBA, FSM, MCM, etc. are interesting hosts for larger pigment molecules. These materials have pore sizes ranging from 2 nm to 50 nm. The organized nano-channels, nano-cages and the unique solvent nature of these materials have profound influence on the photochemistry and photophysics of the guest pigment molecules. The molecules, like chlorophyll, show remarkable photostability in these cages. Moreover, the chemical environment of the molecules can also be tuned by changing the groups on the inner surface of the cages. These interesting properties of the mesoporous materials have led to the research in organization of molecular assemblies in the cages aiming for artificial photosynthesis. In this respect, it is of interest to study how the molecular dynamics and charge transfer processes occur in the molecules caged in the functionalized nano-channels. Femtosecond studies have been performed to gain a better understanding of the molecular dynamics of the natural pigment molecules and their assemblies in the channels and cages of the mesoporous materials. In our contribution we discuss our newest results.