Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 73: Nanostructures at Surfaces: 1D and 2D Structures

O 73.2: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Massive Formation of Highly Oriented Metal-Acetylide Chains Investigated by Scanning Tunneling Microscopy — •Jing Liu, Qiwei Chen, and Kai Wu — BNLMS, SKLSCUSS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Terminal alkynes as novel on-surface reactions precursors have received widespread attention due to their potential in building up diverse nanostructures through different reaction routes. By tuning either the structure of precursors or the metal substrates, terminal alkynes can undergo different reaction pathways and therefore lead to distinct products. Glaser Coupling, cyclotrimerization, radical cyclization, and cross-coupling have all been reported as typical reaction methods of terminal alkynes. However, besides the reactions resulting in covalent bonded structures as mentioned above, terminal alkynes can also take part in the formation of organometallic metal-acetylides which are barely reported as on-surface reaction products of terminal alkynes. In this work, we present a massive formation of highly oriented silver-acetylide chains through the reaction between terminal alkyne and Ag adatoms. The reaction and products were investigated by both STM and DFT calculations. A highly oriented arrangement of chains as well as a perfect match between period of organometallic chains and substrate lattice were observed, and were considered as a significant factor for the stabilization of metal-acetylide chains.