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On-Surface Stereochemical Characterization of a Highly Curved Chiral Nanographene by Noncontact Atomic Force Microscopy and Scanning Tunneling Microscopy
Justus Liebig Univ Giessen, Germany.
Nanyang Technol Univ, Singapore.
Res Ctr Nat Sci, Hungary.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Materialdesign. Linköpings universitet, Tekniska fakulteten. Soochow Univ, Peoples R China.
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2023 (Engelska)Ingår i: CCS CHEMISTRY, ISSN 2096-5745, Vol. 5, nr 12, s. 2888-2896Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A highly distorted chiral nanographene structure composed of triple corannulene-fused [5]helicenes is prepared with the help of the Heck reaction and oxidative photocyclization with an overall isolated yield of 28%. The complex three-dimensional (3D) structure of the bowl-helix hybrid nanostructure is studied by a combination of non contact atomic force microscopy (AFM) and scanning tunneling microscopy (STM) on the Cu(111) surface, density functional theory calculations, AFM/STM simulations, and high-performance liquid chromatography-electronic circular dichroism analysis. This examination reveals a molecular structure in which the three bowl-shaped corannulene bladesd position themselves in a C3-symmetric fashion around a highly twisted triphenylene core. The molecule appears to be shaped like a propeller in which the concave side of the bowls face away from the connected [5]helicene motif. The chirality of the nanostructure is confirmed by the direct visualization of both MMM and PPP enantiomers at the single-molecule level by scanning probe microscopies. These results underline that submolecular resolution imaging by AFM/STM is a powerful real-space tool for the stereochemical characterization of 3D curved chiral nanographene structures.

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CHINESE CHEMICAL SOC , 2023. Vol. 5, nr 12, s. 2888-2896
Nyckelord [en]
chirality at surfaces; noncontact atomicforce microscopy; scanning tunnelling microscopy; submolecular resolution imaging; single-bond resolution; curved nanographenes; multiple helicenes; chiralnanostructures; bowl-helix hybrids; scanning probe microscopy
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URN: urn:nbn:se:liu:diva-197464DOI: 10.31635/ccschem.023.202303065ISI: 001053229000001OAI: oai:DiVA.org:liu-197464DiVA, id: diva2:1794556
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Funding Agencies|Ministry of Education [MOE-T2EP10221-0002]; AcRF Tier 2 [SCHI 619/13]; Ministry of Education Singapore [MOE-T2EP10221-0002, MOE T1 RG11/21]; Deutsche Forschungsgemeinschaft [SCHI 619/13, EB535/1-1]; RK (Research Training Group) 2204 "Substitute Materials for Sustainable Energy Technologies"; LOEWE Program of Excellence of the Federal State of Hesse (LOEWE Focus Group PriOSS "Principles of On-Surface Synthesis"); National Natural Science Foundation of China [21790053, 51821002, 22072103]; National Major State Basic Research Development Program of China [2017YFA0205000, 2017YFA0205002]; Collaborative Innovation Center of Suzhou Nano Science amp; Technology; 111 Project

Tillgänglig från: 2023-09-06 Skapad: 2023-09-06 Senast uppdaterad: 2024-10-03Bibliografiskt granskad

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Niu, KaifengBjörk, Jonas

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