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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cyano-Functionalized Porphyrins on Cu(111) from One-Dimensional Wires to Two-Dimensional Molecular Frameworks: On the Role of Co-Deposited Metal Atoms

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dos Santos, Alisson Ceccatto [1] ; de Campos Ferreira, Rodrigo Cezar [1] ; Moreno-Lopez, Juan Carlos [2, 3] ; Barreto, Lucas [4] ; Lepper, Michael [5] ; Landers, Richard [1] ; Steinrueck, Hans-Peter [5] ; Marbach, Hubertus [5] ; de Siervo, Abner [1]
Total Authors: 9
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Univ Vienna, Fac Phys, A-1090 Vienna - Austria
[3] Yachay Tech Univ, Sch Phys Sci & Nanotechnol, Urcuqui 100119 - Ecuador
[4] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP - Brazil
[5] Friedrich Alexander Univ Erlangen Nurnberg, Lehrstuhl Phys Chem 2, D-91058 Erlangen - Germany
Total Affiliations: 5
Document type: Journal article
Source: CHEMISTRY OF MATERIALS; v. 32, n. 5, p. 2114-2122, MAR 10 2020.
Web of Science Citations: 0

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. (AU)

FAPESP's process: 17/08846-7 - Determination of thermodynamic parameters in the diffusion and formation of tetra-4-chlorophenylporphyrin nanomembranes on Cu(111)
Grantee:Alisson Ceccatto dos Santos
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 07/54829-5 - Electronic and geometric structure of nano-materials: synchrotron radiation studies
Grantee:Richard Landers
Support type: Research Projects - Thematic Grants