Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Organic/bio Molecules on Metal Surfaces IV
O 42.8: Talk
Wednesday, March 13, 2013, 12:15–12:30, H38
Different behaviour of Hydrogenated vs. Fluorinated Tribromobenzene on Ag(111) and Cu(111): the influence of pendant groups — •Stefan Schlögl1,2, Wolfgang M. Heckl1,2, and Markus Lackinger1,2 — 1Department of Physics & TUM School of Education, Tech. Univ. Munich, Schellingstrasse 33, 80333 Munich, Germany — 2Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany
A lot of effort has been put into the realization of the dream of two-dimensional polymers. Bottom-up fabrication of 2D polymers facilitates tailoring of desired electrical, thermal and mechanical properties for new classes of materials and semiconductors.[1] To gain further knowledge about on-surface reactions of 2D polymers, a systematic study of the influence of pendant groups an the self-assembly and polymerization process has been performed. Pendant groups are known to alter physical and electrochemical properties of synthesized polymers.[2] Here we compare the polymerization of s-tribromobenzene derivatives either hydrogenated or perfluorinated on two surfaces. Therefore, 1,3,5-Tribromo-2,4,6-Trifluoro-benzene and 1,3,5-Tribromo-benzene were deposited onto Ag(111) and Cu(111) and characterized by means of scanning tunneling microscopy under ultra-high vacuum conditions. Reaction mechanisms to describe the different behavior of the two monomers are proposed.
[1] Sakamoto, J. et al., Angew. Chem., Int. Ed., 48 (2009), Nr. 6, 1030-1069. [2] Wang, Z. et al., J. Membrane Sci., 285 (2006), Nr. 1-2, 239-248.