Monday, March 4, 2013
3:00 PM - 4:00 PM
Ryan Hall, Ryan 4003
2190 Campus Drive
Evanston, IL 60208 map it
Audience: Faculty/Staff - Student
+1 847 467 2519
Professor Frank Würthner of the Institut für Organische Chemie & Center for Nanosystems Chemistry at the the University of Würzburg is to give a seminar at the ANSER CENTER.
Supramolecular Photosystems Based on Dye Aggregates
Research on dye molecules has been continuing to be at the forefront of new developments in chemistry owing to their versatile functional properties associated with pi-conjugation. On a supramolecular level, appropriately controlled spatial arrangement of dyes enables pivotal functions in nature, the most intriguing examples being provided by the light-harvesting systems of purple and green bacteria which contain a large number of chlorophyll and carotene chromophores organized in cyclic arrays or tubular architectures by non-covalent interactions. During the last few years, Dr Frank Würthner's team has intensively investigated the organization of merocyanine, chlorin, squaraine, and perylene bisimide dyes by non-covalent forces into desirable nanoscale architectures as well as liquid-crystalline and crystalline solid state materials. In this lecture, Dr Würthner will provide an overview on our achievements in the preparation of defined dye assemblies and their functional properties that originate from proper p-p-stacking. In particular, charge and exciton transport in H- and J-aggregates,2 pH-sensitive energy transfer processes in dye vesicles,3 and photovoltaic performance of dye-based bulk heterojunction solar cells4 will be discussed.
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