Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 1: Geometric Organic Structures on Surfaces

SYOH 1.1: Vortrag

Donnerstag, 11. März 2004, 14:00–14:15, H37

Self-assembled molecular architectures — •Elena Mena-Osteritz and Peter Baeuerle — Organic Chemistry II. University of Ulm. Albert-Einstein-allee 11 89081 ULM

Well-defined pi-conjugated macrocycles are of interest as modular building blocks for the assembly of new materials and supramolecular chemistry. They will play an essential role as key components for coming nanoelectronic devices. However, the assembly of molecular materials in nanoscale architectures will be a crucial step for the future molecular scale electronics. On the other side due to their toroidal structure, p-conjugated macrocycles could represent intriguing molecular circuits which would additionally include sites for recognition and selective complexation.

Two years ago our group successfully achieved the synthesis of the first class of fully conjugated macrocycles: the cyclo[n]thiophene. In this contribution we will present the different 2D-arrangements of the macrocycles at the liquid/HOPG interface re-vealed by in-situ scanning tunnelling macroscopy (STM). The data will be analysed with the help of theoretical conformational and MO analyses. By means of STM, we also investigated epitaxy and interactions of C60-fullerenes with 2D crystalline monolayers of cyclo[12]thiophene resulting in perfectly ordered 1:1 complexes. STM-analyses of the nature, specificity and dynamics of the processes taking place at the surface, supported by theoretical calculations, will be discussed.