Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.8: Vortrag

Montag, 20. März 2017, 12:15–12:30, WIL A317

Controlled On-Surface Synthesis of Organic and Organometallic Macrocycles — •Qitang Fan1, Cici Wang2, Tao Wang2, Junfa Zhu2, Min Chen1, Malte Zugermeier1, Claudio K. Krug1, Julian Kuttner1, Gerhard Hilt1, and J. Michael Gottfried11Fachbereich 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 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 * 1)O supergrating, cyclic organometallic tetragons (MTP-Cu)4 and hexagons (MTP-Cu)6 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.

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