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STM/TERS observation of (M)-type diphenyl[7]thiaheterohelicene on Ag(111).
Kimura, Sho; Hattori, Takuma; Ye, Changqing; Okada, Masaki; Kondo, Satoshi; Sakurama, Yui; Saito, Akira; Krukowski, Pawel; Osuga, Hideji; Kuwahara, Yuji.
Afiliación
  • Kimura S; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
  • Hattori T; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
  • Ye C; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
  • Okada M; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
  • Kondo S; Faculty of Systems Engineering, Wakayama University, Wakayama 6408510, Japan.
  • Sakurama Y; Faculty of Systems Engineering, Wakayama University, Wakayama 6408510, Japan.
  • Saito A; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
  • Krukowski P; Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Lodz, 90-236 Lodz, Poland.
  • Osuga H; Faculty of Systems Engineering, Wakayama University, Wakayama 6408510, Japan.
  • Kuwahara Y; Department of Precision Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 5650871, Japan. hattori@prec.eng.osaka-u.ac.jp.
Phys Chem Chem Phys ; 26(9): 7658-7663, 2024 Feb 28.
Article en En | MEDLINE | ID: mdl-38369923
ABSTRACT
The chiral recognition of a self-assembled structure of enantiopure (M)-type 2,13-diphenyl[7]thiaheterohelicene ((M)-Ph-[7]TH) was investigated on a Ag(111) substrate by scanning tunnelling microscopy (STM) and tip-enhanced Raman spectroscopy (TERS). In contrast to previous research of thiaheterohelicene and its derivatives showing zigzag row formation on the Ag(111) substrate, the hexagonal ordered structure was observed by STM. The obtained TERS spectra of (M)-Ph-[7]TH were consistent with the Raman spectra calculated on the basis of density functional theory (DFT), which suggests that (M)-Ph-[7]TH was adsorbed on the substrate without decomposition. The sample bias voltage dependence of STM images combined with the calculated molecular orbitals of (M)-Ph-[7]TH indicates that a phenyl ring was observed as a protrusion at +3.0 V, whereas the helicene backbone was observed at +0.5 V. From these results, a possible model of the hexagonal structure was proposed. Owing to the phenyl ring, the van der Waals interaction between (M)-Ph-[7]TH and the substrate becomes strong. This leads to the formation of the hexagonal structure with the same symmetry as the substrate.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido