Cyano-functionalized porphyrins on Cu(111) from one-dimensional wires to two-dimensional molecular frameworks : on the role of Co-deposited metal atoms
| Autor: | Santos, Alisson Ceccatto dos, 1995, Ferreira, Rodrigo Cezar de Campos, 1987, Landers, Richard, 1946, Siervo, Abner de, 1972 |
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| Přispěvatelé: | UNIVERSIDADE ESTADUAL DE CAMPINAS |
| Rok vydání: | 2020 |
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| Zdroj: | Repositório Institucional da Unicamp Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP Repositório da Produção Científica e Intelectual da Unicamp |
| Popis: | Agradecimentos: Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) project nos. 2017/08846-7 and 2007/54829-5, CAPES (PROBRAL) grant number 1925/2016, and CNPq from Brazil are gratefully acknowledged. J.C.M.-L. would like to also gratefully acknowledge Yachay Tech University and its authorities for the support to perform the experiments at Instituto de Fisica Gleb Wataghin in Campinas, Brazil. M.L. and H.M are grateful for travel grants from the DAAD Abstract: Metal adatoms play a key role in surface diffusion, adsorption conformation, and self-assembly of porphyrin molecules on metal surfaces. Herein, we study the specific influence of coadsorption of Fe, Co, and Pd atoms on the behavior of 2H-tetiakis(p-cyano)phenylporphyrin (2H-TCNPP) on Cu(111) using scanning tunneling microscopy. Upon codeposition of Fe and Co, the molecules form one-dimensional (1D) linear chains after mild annealing on Cu(111) driven by the interaction of its cyano groups with metal adatoms. A similar behavior has been observed previously on Cu(111), mediated by Cu adatoms, where the functional CN groups were also found to lower the reaction rate of the so-called porphyrin self-metalation reaction with Cu atoms significantly, in comparison to the non-cyano-functionalized porphyrin. Upon co-deposition of Pd and mild annealing, we find a remarkably different behavior, that is, a massive reorganization from 1D molecular chains to a peculiar rectangular 2D (two-dimensional) network. The molecular appearance changes to a clover shape, which is attributed to a Pd-induced dehydrogenation and subsequent ring closure reaction of the phenyl and pyrrole groups FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES Fechado |
| Databáze: | OpenAIRE |
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