| Full text | |
| Author(s): |
de Campos Ferreira, Rodrigo Cezar
[1]
;
Paz, Alejandro Perez
[2, 3, 4, 5]
;
Mowbray, Duncan John
[2]
;
Roulet, Jean-Yves
[1]
;
Landers, Richard
[1]
;
de Siervo, Abner
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, UNICAMP, BR-13083859 Campinas - Brazil
[2] Yachay Tech Univ, Sch Phys Sci & Nanotechnol, Urcuqui 100119 - Ecuador
[3] United Arab Emirates Univ, Coll Sci, Dept Chem & Biochem, Al Ain - U Arab Emirates
[4] Univ Basque Country, Nanobio Spect Grp, UPV EHU, E-20018 San Sebastian - Spain
[5] Univ Basque Country, ETSF Sci Dev Ctr, Dept Fis Mat, UPV EHU, E-20018 San Sebastian - Spain
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Journal of Physical Chemistry C; v. 124, n. 26, p. 14220-14228, JUL 2 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
Surface-assisted Ullmann-type coupling reactions are a potential bottom-up approach for building tailored low-dimensional materials with novel physical and chemical properties. In this investigation combining scanning tunneling microscopy (STM), density functional theory (DFT), and X-ray photoelectron spectroscopy (XPS), we study the adsorption behavior, supramolecular ordering, and chemical and physical changes upon annealing of a 5,10,15,20-tetrakis(4-chlorophenyl) porphyrin (Cl4TPP) on the Ag(111) surface. At room temperature, well-ordered two-dimensional (2D) assemblies grow preferentially along the < 1 (1) over bar0 > directions, revealing the coexistence of two distinguishable porous and zigzag structures and lattice parameters. Our DFT calculations show that Cl4TPP adsorbs in the typical saddle-shape conformation on Ag(111) and that the coexistence of these two overlayers is due to translations between nearly isoenergetic adsorption sites. Furthermore, to self-polymerize the organic mesh via an on-surface Ullmann-type coupling reaction, we performed an STM and XPS study of the system upon annealing, following the chemical and structural modifications above room temperature. Under these conditions, we obtain a highly compact 2D framework composed of dechlorinated molecules. (AU) | |
| FAPESP's process: | 17/09529-5 - Formation of 2D molecular nanopore-membranes via Ullmann reaction with tetra-4-chlorophenylporphyrin on Ag(111) |
| Grantee: | Jean-Yves Roulet |
| Support Opportunities: | 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 Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 07/08244-5 - Study of the magnetic properties of Pd and PdAu ultrathin films and nanoparticles by using XMCD |
| Grantee: | Abner de Siervo |
| Support Opportunities: | Regular Research Grants |