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SUMMARY:New Carbon Allotropes and Nanographenes: Prototyping via On-Surfac
 e Synthesis and Single-Molecule Manipulation
DTSTART:20251028T151500Z
DTEND:20251028T170000Z
DTSTAMP:20260722T050700Z
UID:indico-event-279@indico.physik.uni-bielefeld.de
DESCRIPTION:Speakers: Prof. Dr. Michael Gottfried\n\nRecent advancements o
 f on-surface synthesis techniques enable the fabrication and precise chara
 cterization of carbon-based nanomaterials with atomic-scale precision. The
 se materials often exhibit novel (opto)electronic and magnetic properties\
 , arising both from the intrinsic features of the molecular precursors and
  the unique structures formed during synthesis. On-surface synthesis thus 
 provides a highly versatile alternative to conventional solution-phase che
 mistry\, giving access toproducts that are otherwise synthetically inacces
 sible.In particular\, the search for nonbenzenoid  sp^2 carbon allotrope
 s has driven substantial research due to their predicted unique mechanical
 \, electronic\, and transport properties. However\, their synthesis remain
 s challenging owing to the lack of reliable protocols for generating nonhe
 xagonal rings. We have developed various on-surface synthesis strategies b
 y which polymer chains are linked to form nonbenzenoid carbon networks. Th
 is approach enabled the synthesis of biphenylene network\, a carbon allotr
 ope with 4-\, 6-\, and 8-membered rings (Figure 1a)\, which exhibits metal
 lic behaviour already at very small dimensions [1]\, along with other nove
 l carbon networks.Acenes represent another key class of carbon materials w
 ith potential for use in organic electronics. Using multistep single-molec
 ule manipulation\, we synthesized tridecacene (13ac) [2] and pentadecacene
  (15ac) [3]\, the longest acenes known to date (Figure 1b). We find antife
 rromagnetic open-shell ground state electron configurations for both acene
 s. Notably\, 15ac shows a low-bias spin-excitation feature\, indicating a 
 singlet-triplet gap of around 124 meV. Investigation of 15ac complexes wit
 h up to 6 gold atoms suggest considerable multiradical contributions to th
 e electronic ground state of 15ac.Doping with heteroatoms alters the elect
 ronic and magnetic properties of carbon-based nanomaterials. We present a 
 variety of nitrogen-containing carbon nanostructures including planar and 
 curved cycloarenes (Figure 1c) as well as N-doped graphene nanoribbons and
  acenes [4].\nReferences:[1] Q.T. Fan et al.\, J.M. Gottfried\, Science 37
 2\, 852-856 (2021)\, 10.1126/science.abg4509.[2] Z. Ruan et al.\, J.M. Got
 tfried\, J. Am. Chem. Soc. 146\, 3700-3709 (2024)\, 10.1021/jacs.3c09392.[
 3] Z. Ruan et al.\, J.M. Gottfried\, J. Am. Chem. Soc. 147\, 4862–4870 (
 2025)\, 10.1021/jacs.4c13296.[4] Z. Ruan et al.\, J.M. Gottfried\, Angew. 
 Chem. Int. Ed. e202504707 (2025)\, 10.1002/anie.202504707.\n \n\nFigure 1
 . (a) Biphenylene network\, (b) long acenes by single-molecule manipulatio
 n\, (c) N-doped cycloarene.\n \n \n \nJ. Michael Gottfried is a profess
 or (W3) of Physical Chemistry at the University of Marburg\, Germany. His 
 current research interests encompass on-surface synthesis\, cyclic nanogra
 phenes\, synthetic carbon allotropes\, non-benzenoid aromatic systems\, an
 d porphyrin-based materials\, which are generated and studied using advanc
 ed surface-science techniques. He received his PhD degree in 2003 from the
  Freie Universität Berlin\, after studies of Chemistry and Physics in Dar
 mstadt\, St. Andrews\, and Berlin. After postdoctoral research at the Univ
 ersity of Washington (with C.T. Campbell)\, and habilitation at the Univer
 sität Erlangen-Nürnberg (with H.-P. Steinrück)\, he was appointed to a 
 professorship at the University of Marburg in 2011. The held a guest profe
 ssorship at the University of Science and Technology of China (USTC) and r
 eceived the International Partnership Award for Young Scientists of the Ch
 inese Academy of Sciences and the SCS Lectureship of the Swiss Chemical So
 ciety\, among other awards. He has been the vice-spokesperson of the Resea
 rch Center CRC 1083 “Structure and Dynamics of Internal Interfaces” of
  the German Science Foundation since 2021 and received an ERC Synergy Gran
 t in 2022. Publications: https://scholar.google.com/citations?hl=en&user=N
 trpwsEAAAAJ\n \n \n\nhttps://indico.physik.uni-bielefeld.de/event/279/
LOCATION:H6 (UHG)
URL:https://indico.physik.uni-bielefeld.de/event/279/
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