Engineering two-dimensional supramolecular self-assembly: The role of Cl atoms

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Ceccatto, Alisson ; Campi, Gustavo Ramon ; Diaz, Vanessa Carreno ; Ferreira, Eidsa Brenda da Costa ; Waleska-Wellnhofer, Natalie J. ; Freiberger, Eva Marie ; Jaekel, Simon ; Papp, Christian ; Steinrueck, Hans-Peter ; Mowbray, Duncan John ; de Siervo, Abner

• Tipo de documento: Artigo Científico
• Fonte: FLATCHEM; v. 50, p. 7-pg., 2025-03-01.

Resumo

On-surface synthesis is a powerful tool for engineering two-dimensional (2D) organic nanostructures by controlling intermolecular interactions between the building blocks. Herein, we explore the role of Cl adatoms in the synthesis and characterization of self-assembled 1,3,5-tris[4-(pyridin)-[1,1'-biphenyl]benzene (TPyPPB) networks on Ag(111), by combining scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT). In the absence of Cl, upon deposition at room temperature (RT), TPyPPB molecules form a highly ordered porous supramolecular network with triangular packing, stabilized by hydrogen bonds (N--H). In the presence of Cl adatoms, sublimated onto the surface using dichloro-(1,10phenanthrolin)-platin(II) (Cl2PhPt) a second molecular precursor, we observe a so-called mixed phase or inverted packing, depending on the applied growth procedure. The mixed phase is characterized by a nonperiodic structure stabilized by intermolecular interactions between TPyPPB, Cl2PhPt, and Cl. In contrast, when only Cl adatoms and TPyPPB are present on the Ag(111) surface, a non-porous supramolecular arrangement is obtained, stabilized by C-H--Cl hydrogen bonds. (AU)

• Processo FAPESP: 22/12929-3 - Síntese na superfície de materiais de baixa dimensão de camada única e propriedades ajustáveis: entendendo sua integridade química, propriedades vibracionais, eletrônicas, e de spin
• Beneficiário: Abner de Siervo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/04411-1 - Estudo da estrutura eletrônica e atômica de grafeno nanoporoso funcionalizado via síntese química de superfícies
• Beneficiário: Alisson Ceccatto dos Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 07/54829-5 - Estrutura eletrônica e geométrica de nano materiais: um estudo por radiação sincroton
• Beneficiário: Richard Landers
• Modalidade de apoio: Auxílio à Pesquisa - Temático