Reassessing the Adsorption Behavior and on-Surface Reactivity of a Brominated Porphyrin on Cu(111)

Autor(es)

dos Santos, Alisson Ceccatto ^[1] ; Herrera-Reinoza, Nataly ^[1] ; Paz, Alejandro Perez ^[2] ; Mowbray, Duncan John ^[3] ; de Siervo, Abner ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, UNICAMP, BR-13083859 Campinas - Brazil

^[2] United Arab Emirates Univ UAEU, Coll Sci COS, Dept Chem & Biochem, Al Ain - U Arab Emirates

^[3] Yachay Tech Univ, Sch Phys Sci & Nanotechnol, Urcuqui 100119 - Ecuador

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 125, n. 31, p. 17164-17173, AUG 12 2021.
• Citações Web of Science: 0

Resumo

On-surface coupling reactions and molecular conformation are essential processes for building tailored functional molecular nanostructures. Here, we study the thermal debromination and reactivity of free-base tetra(4-bromophenyl) porphyrin (H2TBrPP) on Cu(111) as a function of the substrate temperature. It has been previously reported in the literature that C-Br bonds remain intact at room temperature (RT) and that the Br center dot center dot center dot Cu(111) interaction induces a drastic surface reconstruction around the molecule periphery and a distortion in the adsorbate itself. However, based on a combination of STM and XPS experiments, supported by density functional theory (DFT) calculations, we instead demonstrate that debromination readily occurs at RT, leading to a new interpretation of both the adsorption behavior and the molecular coupling of H2TBrPP on Cu(111). For the molecules deposited on the metallic substrate held above RT, our STM measurements show the growth of ordered 2D metal-organic frameworks (MOFs). (AU)

• 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
• Processo FAPESP: 07/08244-5 - Estudo das propriedades magnéticas de filmes ultrafinos e nanopartículas de Pd e PdAu via XMCD
• Beneficiário: Abner de Siervo
• Modalidade de apoio: Auxílio à Pesquisa - Regular