2019年3月22日下午16:00 Frank Würthner教授学术报告

报告简介：

Functional materials composed of p-stacked dyes and organic semiconductor molecules have gained increasing popularity during the last two decades. However, our understanding is still rather limited with regard to the impact of particular packing arrangements in the solid state on the optical and electronic properties of dye-based materials. Studies on dye assemblies in solution^[1] constitute the missing link, providing many insights into the coupling among chromophores upon p-p-stacking, in particular with regard to absorption and fluorescence properties. Within our research on dye assemblies of dipolar merocyanine dyes^[2] and quadrupolar perylene bisimide dyes^[3] we became, however, aware of severe limitations: Thus, it is very challenging for the conventional self-assembly approach to establish a particular dye-dye packing arrangement and to limit the size of an aggregate to a desired supramolecular species. As a consequence of these limitations many interesting scientific questions could not be addressed in the past.

In this talk I will show how tweezer,^[4] foldamer^[2] and macrocyclic^[5] architectures can be utilized to position dye molecules into predefined positions. Furthermore, I will show how particular arrangements afford entirely different photophysical properties. These results should be of high relevance for the more rational design of functional supramolecular photosystems and organic solid state materials.

References

[1]   Z. Chen, A. Lohr, C. R. Saha-Möller, F. Würthner, Chem. Soc. Rev. 2009, 38, 564-584.

[2]   F. Würthner, Acc. Chem. Res. 2016, 49, 868–876.

[3]   F. Würthner, C.R. Saha-Möller, B. Fimmel, S. Ogi, P. Leowanawat, D. Schmidt, Chem. Rev. 2016, 116, 962-1052

[4]   D. Bialas, A. Zitzler-Kunkel, E. Kirchner, D. Schmidt, F. Würthner, Nature Commun. 2016, 7, 12949    

[5]   P. Spenst, R. M. Young, B. T. Phelan, M. Keller, J. Dostál, T. Brixner, M. R. Wasielewski, F. Würthner, J. Am. Chem. Soc. 2017, 139, 2014–2021.

Würthner教授简介

Frank Würthner received his education in Chemistry at the University of Stuttgart (doctoral degree 1994) and carried out postdoctoral research at MIT in Cambridge/MA (USA). After two years at BASF and five years at the University of Ulm (Habilitation in 2001) he became chair professor of Organic Chemistry at the University of Würzburg in 2002. Here he has served as head of the Institute of Organic Chemistry, dean of the Chemistry Department and founding director of the Center for Nanosystems Chemistry. His main research interests include the synthesis of pi-conjugated molecules and functional dyes, their application in organic electronics, photonics and photovoltaics, the construction of complex supramolecular architectures composed of pi-scaffolds, the mechanistic elucidation of self-assembly processes, and the investigation of light-induced processes in dye-based nanosystems. He has published more than 400 papers and is listed since 2014 regularly among the highly cited chemists of the last decade. He is an elected member of the German National Academy of Science Leopoldina and the Bavarian Academy of Sciences, as well as a Fellow of the Royal Society of Chemistry. His awards include the Arnold-Sommerfeld-Prize of the Bavarian Academy of Science (2002), the Elhuyar-Goldschmidt Award of the Royal Society of Spain (2016) and the Ta-Shue Chou Lectureship Award of Academia Sinica (2018). Since 2016 he is Associate Editor or Organic Chemistry Frontiers.