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UID:DSC-12438
DTSTART;TZID=Europe/Berlin:20170202T130000
SEQUENCE:1486022072
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170202T140000
URL:https://dresden-science-calendar.de/calendar/de/detail/12438
LOCATION:TUD Materials Science - HAL\, Hallwachsstraße 301069 Dresden
SUMMARY:Lackinger: On-Surface Synthesis of 2D polymers - the role of bond r
 eversibility
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Markus Lackinger\nInstitute of Speaker: Deutsche
 s Museum & Technische Universit&aumlt M&uumlnchen\nTopics:\nMaterialien\n 
 Location:\n  Name: TUD Materials Science - HAL (115\, Hallwachsstr. 3)\n  
 Street: Hallwachsstraße 3\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDes
 cription: The polymerization of organic monomers on solid surfaces is a pr
 omising 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 inaccessibl
 e by other synthetic means. Yet\, many important reactions\, as for instan
 ce Ullmann coupling\, normally proceed irreversibly. Consequently\, the la
 ck of error correction mechanisms during growth inevitably results in netw
 orks with high defect densities. In contrast\, supramolecular self-assembl
 y based on reversible intermolecular interactions is well-known to yield n
 etworks with high structural quality. The presentation introduces and disc
 usses different concepts\, how bond reversibility and non-covalent self-as
 sembly can also be utilized for the on-surface synthesis of covalent nanos
 tructures: A more obvious option is the use of coupling reactions that can
  proceed reversibly as for instance boronic acid condensation. Yet\, on th
 e appropriate surface even a notoriously irreversible reaction as Ullmann 
 coupling can exhibit an organometallic intermediate featuring bond reversi
 bility. We will demonstrate that equilibration of these organometallic int
 ermediates is advantageous to improve the structural quality of covalent n
 etworks. Lastly\, the most elegant\, but most specialized option is to fir
 stly use non-covalent interactions for pre-assembling an ordered structure
 \, and to secondly induce covalent cross-linking while maintaining this in
 itial arrangement. A topochemical photopolymerization on a solid surface w
 ill be discussed as an implementation of this principle.
DTSTAMP:20261017T160731Z
CREATED:20170125T075811Z
LAST-MODIFIED:20170202T075432Z
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