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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 02 February 2017
(at 13:00 in room 115, Hallwachsstr. 3)
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On-Surface Synthesis of 2D polymers - the role of bond reversibility

Prof. Markus Lackinger

Deutsches Museum & Technische Universität München

The polymerization of organic monomers on solid surfaces is a promising and versatile synthetic route for the bottom-up fabrication of 2D polymers. Various coupling reactions are successfully employed for the on-surface synthesis of extended covalent nanostructures that are inaccessible by other synthetic means. Yet, many important reactions, as for instance Ullmann coupling, normally proceed irreversibly. Consequently, the lack of error correction mechanisms during growth inevitably results in networks with high defect densities.
In contrast, supramolecular self-assembly based on reversible intermolecular interactions is well-known to yield networks with high structural quality. The presentation introduces and discusses different concepts, how bond reversibility and non-covalent self-assembly can also be utilized for the on-surface synthesis of covalent nanostructures: A more obvious option is the use of coupling reactions that can proceed reversibly as for instance boronic acid condensation. Yet, on the appropriate surface even a notoriously irreversible reaction as Ullmann coupling can exhibit an organometallic intermediate featuring bond reversibility. We will demonstrate that equilibration of these organometallic intermediates is advantageous to improve the structural quality of covalent networks. Lastly, the most elegant, but most specialized option is to firstly use non-covalent interactions for pre-assembling an ordered structure, and to secondly induce covalent cross-linking while maintaining this initial arrangement. A topochemical photopolymerization on a solid surface will be discussed as an implementation of this principle.

Announcement (pdf)

Brief Bio:

Markus Lackinger studied physical engineering at the University of Applied Sciences in Munich from 1994 to 2000. In his postgraduate studies he specialized in the field of surface science and nano science. In 2003 he obtained a PhD from the University of Technology in Chemnitz in experimental physics. During the PhD thesis he had a research stay at Columbia University with George W. Flynn. After his graduation he gained additional experience through postdoctoral fellowships at the Ludwig-Maximilians-University (LMU) with Prof. Wolfgang Heckl (03-05) and at the University of California at Irvine (UCI) with Prof. Wilson Ho (05-06). Since 2006 Markus Lackinger leads a research group focused on molecular nano-science on surfaces, initially at the LMU, currently at the Deutsches Museum in cooperation with the Technical University Munich.

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.05.05 Wed
author: webadmin