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SUMMARY:On-surface synthesis by atomic manipulation studied with atomic fo
 rce microscopy
DTSTART:20180419T171500
DTSTAMP:20260407T024517Z
UID:61da53cad915567f4d14dbe71d78a45a3b530a747b9ff9812efd9e29
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Leo Gross\nIBM Zurich\nElusive molecules can be created 
 using atomic manipulation with a combined atomic force/scanning tunneling 
 microscope (AFM/STM). Molecules that are highly reactive and short-lived u
 nder ambient conditions can be stabilized at low temperature and by using 
 inert surfaces. Employing high-resolution AFM with CO functionalized tips 
 [1] provides insights into the structure\, geometry\, aromaticity and bond
  orders of the molecules created and into the reactions performed [2]. STM
  is used to map orbital densities and obtain information about the occupat
 ion of orbitals and transport gaps.\n \nWe created radicals\, diradicals 
 [3]\, antiaromatic and non-Kekulé molecules [4] and studied their structu
 ral and electronic properties. We recently showed that the reorganization 
 energy of a molecule on an insulator can be determined [5]. In addition\, 
 we expanded the toolbox for the synthesis of molecules by atomic manipulat
 ion\, demonstrating reversible cyclisation reactions [3] (see Figure) and 
 skeletal rearrangements.\n\nFigure: Reversible Bergman cyclization by atom
  manipulation: Chemical reaction scheme (top). CO-tip AFM data (bottom)\, 
 showing the different reaction steps an individual molecule on bilayer NaC
 l on Cu(111) . All reaction steps are induced by bias voltage pulses with 
 the AFM tip. [3]\n \n\nReferences:\n[1] L. Gross et al. Science 325\, 111
 0 (2009)\n[2] L. Gross et al. Angew. Chem Int. Ed. DOI: 10.1002/anie.20170
 3509 (2018)\n[3] B. Schuler et al. Nat. Chem. 8\, 220 (2016)\n[4] N. Pavli
 ček et al. Nat. Nano. 12\, 308 (2017)\n[5] S. Fatayer et al. Nat. Nano. a
 ccepted (2018)\n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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