Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy

MO 5.28: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Ultrafast vibratioanl and structural dynamics in water solutions of macrocycle hosts and iodine — •Mehdi Mohammad Kazemi, Patrice Donfack, Mahesh Namobodri, and Arnulf Materny — School of Engineering and Science, Jacobs University, Campus Ring 1, D-28759 Bremen, Germany

The formation of supramolecular architectures offers several possibilities to visualizenew structural and dynamical properties of small guest molecules restrained within well-defined environments. Molecules confined within the restrained space of mesoporous materials display interesting properties in general and this aspect has been widely studied and exploited. Meanwhile the ability of a single, so-called macrocycle, to embody another molecule (i.e., at the molecular level) has attracted particular interest. Several ultrafast molecular responses are associated with some degree of nonlinearity in the medium concerned. It can happen that simply the molecular assembling, such as aggregation in solution and the formation of host-guest complexes with geometry restriction, as discussed in the present contribution, can lead to or notably influence nonlinear processes in the medium. In the present contribution, ultrafast vibratioanl and structural dynamics in water solutions of macrocycle hosts and iodine are discussed. Especially, we have observed different Kerr effect dynamics in the presence of cucurbituril macrocycles (with or without iodine) in water. We also discussed the characteristics of ultrafast transient absorption dynamics of iodine trapped inside cucurbituril macrocycles in comparison with the results obtained in cyclodextrins and zeolite nanocrytals.