Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 111: Nanostructures at Surfaces: Molecular Systems III

O 111.3: Vortrag

Freitag, 24. März 2017, 11:00–11:15, REC/PHY C213

Controlled On-Surface Synthesis of Organic and Organometallic Macrocycles — •Qitang Fan¹, Tao Wang², Cici Wang², Junfa Zhu², Min Chen¹, Malte Zugermeier¹, Claudio K. Krug¹, Julian Kuttner¹, Gerhard Hilt¹, and J. Michael Gottfried¹ — ¹Fachbereich Chemie, Philipps-Universität Marburg, Germany — ²National Synchrotron Radiation Laboratory, University of Science and Technology of China

Macrocycles and cyclic polymers have properties distinctly different from those of their linear counterparts. While effective approaches for their synthesis in solution remain scarce, on-surface synthesis has proven to be a viable alternative due to the inherent template effects. The controlled formation of hyperbenzene and organometallic macrocycles has been achieved on (modified) metal surfaces from 4,4”-dibromo-m-terphenyl (DBMTP) precursor molecules. Hyperbenzene, a hexagon consisting of 18 phenyl rings, forms on Cu(111), Ag(111) and Au(111) with different yields, which are maximized under pseudo-high dilution conditions. On clean Cu(110), DBMTP reacts to form zigzag organometallic chains linked with C-Cu-C bonds. However, with a template based on a Cu(110)-(2 x 1)O supergrating, cyclic organometallic tetragons and hexagons are obtained on the Cu stripes (with width from 2.6 nm to 3.6 nm).These methods may pave the way for the synthesis of other macrocycles.