Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 111: Nanostructures at Surfaces: Molecular Systems III

O 111.8: Vortrag

Freitag, 24. März 2017, 12:15–12:30, REC/PHY C213

Imaging on-surface hierarchical assembly of chiral organometallic polymers — •Laerte L. Patera^1,2,3, Zhiyu Zou^2,4, Carlo Dri^2,3,5, Cristina Africh², Jascha Repp¹, and Giovanni Comelli^2,3 — ¹Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — ²IOM-CNR Laboratorio TASC, Area Science Park, 34149 Trieste, Italy — ³Department of Physics, University of Trieste, 34127 Trieste, Italy — ⁴Abdus Salam International Centre for Theoretical Physics, 34151 Trieste, Italy — ⁵Elettra - Sincrotrone Trieste S.C.p.A., 34149 Trieste, Italy

We report the first real-time observation of the self-assembly mechanisms driving the hierarchical expression of supramolecular chirality, for 10,10'-dibromo-9,9'-bianthryl on Cu(111). Molecular recognition steers a multi-level chirality transfer, leading first to the growth of chiral organometallic chains and then to the formation of enantiopure islands. The structure of the polymeric networks has been determined by means of non-contact atomic force microscopy (nc-AFM), while high-speed scanning tunnelling microscopy (STM) revealed details of the surface kinetics. The direct observation of the assembly mechanisms allowed us to evaluate the enantioselectivity of the interchain coupling, shedding light on the driving forces of the hierarchical chirality expression. Our results provide an extended characterization of processes involved in the sequential self-assembly of enantiopure structures, paving the way for the design of functional supramolecular architectures.