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[纳米物理与器件实验室系列学术报告(98) ] Optimizing Old Reactions vs. Exploring New Reactions–What is the Most Promising Way for On-Surface Synthesis?
时间: 2017年09月01日 10:00
地点: 中科院物理研究所 A 楼二层234会议室
报告人: Prof. Dr. Markus Lackinger

Technische Universität München & Deutsches Museum,Email: markus.lackinger@tum.de

报告人简介
Educational and Professional Experiences:
-studies: physical engineering at the University of Applied Sciences Munich; -PhD in experimental physics from TU Chemnitz (Prof. Michael Hietschold)
-research stay at Columbia University (Prof. George W. Flynn); -postdoc at the LMU München (Prof. Wolfgang M. Heckl)
-postdocs at the University of California Irvine (Prof. Wilson Ho); -substitute professorship (LMU München)
-habilitation in material science (LMU München); -habilitation in experimental physics (TU München)
-adjunct professor (LMU München); -independent research group leader at the Deutsches Museum in cooperation with TU München
Research Interests:
-surface functionalization with organic molecules; -chemistry on solid surfaces with focus “on-surface polymerization”
-supramolecular self-assembly (kinetics & quantitative thermodynamics); -scanning probe microscopy (under ambient conditions & in ultra-high vacuum)
-synchrotron based characterization; -x-ray photoelectron spectroscopy (XPS); -x-ray absorption spectroscopy (NEXAFS);-Low Energy Electron Diffraction (LEED)

报告摘要:
On-surface synthesis is a dynamically evolving research field with unmatched possibilities to fabricate low-dimensional covalent organic nanostructures by polymerization of functionalized monomers directly on solid surfaces. This approach avoids the notorious solubility issues of solution chemistry, thereby facilitating the synthesis of extended covalent 1D and 2D nanostructures. A further important benefit is the analytical accessibility of surface-supported nanostructures, allowing for characterization by surface-sensitive techniques, foremost real space imaging by scanning probe microscopy.
The presentation will discuss recent advancements and challenges in the on-surface synthesis of extended covalent nanostructures. A particularly important and widespread coupling reaction is the so called surface-assisted Ullmann coupling, where halogenated precursors recombine by forming interlinking C-C bonds after the thermally activated dehalogenation on the surface. Here it is particularly instructive to focus on differences between seemingly very comparable metal surfaces, i.e. Au(111) vs. Ag(111). On the other hand, even though quite challenging, the tool box of on-surface synthesis is continuously enlarged by newly discovered or developed coupling reactions. In most cases these are inspired by solution chemistry, but transferring the coupling reactions onto surfaces can have implications that reach significantly beyond imposed geometrical constraints. Exemplarily, the thermally induced surface chemistry of a three-fold thiol functionalized monomer on Au(111) will be discussed. Most on-surface couplings require an active chemical contribution of the underlying surface, and hence only proceed on metal surfaces. Accordingly, the reaction products adsorb on the strongly interacting metal surfaces, often with profound consequences for their electronic and geometric structure. For many applications, in particular in molecular electronics, this is considered limiting and detrimental.  To alleviate the surface influence, we propose intercalation of an iodine monolayer is a facile means for post-synthetic decoupling.
[1] Chem. Commun., 2017, 53, 7872-7885 (feature article)
[2] Nanoscale, 2017, 9, 4995-5001
[3] ACS Nano, 2016, 10, 10901-10911
[4] Angew. Chem. Int. Ed., 2016, 55, 7650-7654
[5] ACS Nano, 2014, 8, 7880-7889
[6] Chem. Commun., 2014, 50, 5680-5682

邀请人:杜世萱  (82649823)


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