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Materials Science at the Atomic Scale: Structure, chemical reactions and complex architectures

Jueves, 18 de Enero de 2018 - 11:00
Donostia International Physics Center
Alexander Riss, Technical University of Munich, Physik-Department E20, Garching (Germany)
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Effective synthesis
and utilization of functional molecular materials relies on control of arrangement,
interaction and coupling of molecular units in specific reaction environments,
as well as an understanding on how these parameters affect the physical and
chemical properties of the products.

         Our studies focus on atomic-level
investigations of the microscopic driving forces of surface-supported
intermolecular reactions of organic molecules along with changes of their electronic
properties. In particular, we have directly determined the mechanisms
underlying complex bimolecular coupling and cyclization reactions through
real-space imaging of the precise bond configuration of intermediate species
using atomic force microscopy (AFM; Fig. 1a) [1]. We will demonstrate how such
cyclization reactions can be used for directed one-dimensional molecular growth
and show how low-energy extended electronic states are formed in conjugated
polymeric chains (Fig. 1b) [2].

         We will discuss how metal/molecule/insulator
structures provide opportunities to protect organic materials from atmospheric
pressure and to control chemical reactions through geometric confinement [3].


[1] A. Riss et al. Nat.
8, 678 (2016)

[2] A. Riss et al. Nano
14, 2251 (2014)

[3] J. Ducke et al. submitted

[4] M. Schwarz et
al.: ACS Nano 11, 9151 (2017)

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