Prof. Giuseppe Zerbi "The Role of Molecular Dynamics and Vibrational Spectroscopy in the Science of Organic Polyconjugated Systems"
Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica, Piazza L.Da Vinci 32, Milano, Italia
What |
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When |
May 29, 2013 from 02:15 PM to 03:00 PM |
Where | Hörsaal Makromolekulare Chemie, Stefan-Meier-Str. 31, Freiburg |
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Thanks to advanced technology the possibility to explore the properties of materials via infrared and Raman spectroscopy allows to study peculiar physical phenomena at the molecular level. In this lecture we will focused at the class of polyconjugated organic materials whose properties are modulated by the extent of delocalization of pi electrons along the molecular chain. First, simple analytical group frequency spectroscopy combined with normal coordinate analysis can help in the determination of the chemical structure and architecture of the molecules; then redox reactions (doping) and photoexcitation can be monitored through the infrared spectrum; electron/phonon coupling can be measured with Raman spectroscopy (resonance Raman spectroscopy with various excitation wavelengths).
Of particular interest is the physics associated to the collective totally symmetric Raman active C=C stretching mode which is the only easily accessible tool for understanding many physical properties which are of interest to technology.
The molecular physics of typical polyconjugated systems will be presented and discussed.