Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Organic Molecules on Inorganic Substrates VI: Chirality, Charge Transfer, Self-Assembly
O 83.4: Vortrag
Donnerstag, 4. April 2019, 16:00–16:15, H9
Chirality transfer through multistep reaction processes — •Mohammed S. G. Mohammed1,2, Nestor Merino-Díez1,2,3, Jesus Castro-Esteban4, James Lawrence1,2, Alejandro Berdonces Layunta1,2, Luciano Colazzo1,2, Jose Ignacio Pascual3,5, Diego Peña4, and Dimas G. de Oteyza1,2,5 — 1Donostia International Physics Center (DIPC), San Sebastian, Spain — 2Materials Physics Center, Centro de Física de Materiales (CSIC/UPV-EHU), San Sebastian, Spain — 3CIC nanoGUNE, San Sebastián, Spain — 4Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela, Spain — 5Ikerbasque, Basque Foundation for Science, Bilbao, Spain
Besides its interest for potential optoelectronic devices, molecular chirality is of utmost importance in biology and medicine. Consequently relevant is the selective synthesis of enantiopure molecular compounds, which has been hardly addressed in the growing field of on-surface synthesis. In this frame, 2,2*-dibromo-9,9*-bianthracene reactants are known to form chiral graphene nanoribbons on coinage metal substrates through a complex multi-step reaction including an initial polymerization by Ullmann coupling and following cyclodehydrogenation steps.In this work we show how, starting from enantiopure reactants deposited onto Au(111), their chirality is sequentially transferred to the polymers and finally to the GNRs with an excellent level of selectivity. Unambiguous evidence of this effect is obtained by high-resolution images of the polymers and GNRs at the single molecule level.