| Full text | |
| Author(s): |
Barreto, Rafael Reis
;
Prior, Iago Aedon Silva
;
Ferreira, Eidsa Brenda da Costa
;
Carreno-Diaz, Vanessa
;
Weiler, Igor Stein
;
Thill, Alisson Steffli
;
Bernardi, Fabiano
;
de Siervo, Abner
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Surface Science; v. 766, p. 8-pg., 2026-03-01. |
| Abstract | |
In this study, we report a surface-confined metal-organic networks (SMON) obtained by post-depositing Fe onto a sub-monolayer of 5,10,15,20-tetra(4-pyridyl)porphyrin on Ag(100) and activating at 350 K. Scanning tunneling microscopy (STM) reveals a rectangular/square lattice built from pyridyl-Fe-pyridyl nodes, coexisting with close-packed TPyP domains. Two reproducible junction motifs emerge at identical lattice positions: high-contrast nodes and lower-contrast nodes, consistent with, respectively, an on-top Fe bridge above and below the pyridyl plane, which is stabilized closer to Ag(100). Raising the activation temperature by heat treatment to 400 K, the island density decreases, and the median island size increases. Increasing the Fe dose at 350 K, the islands grow up to similar to 90 molecules per island before a plateau, indicating a crossover from diffusion-limited to site/supply-limited growth. At 450 K, intramolecular metalation proceeds without long-range coordination, resulting in a metalated, but unlinked, monolayer. These observations establish a temperature and dose window for assembling Fe-TPyP SMON on Ag(100) and highlight how substrate registry and coordination chemistry produce distinct junction heights within an otherwise rigid square metric. We report a new motif that appears at 350 K, characterized by an ordered phase resembling a double-lobed linker node that forms extended domains. (AU) | |
| 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: | 22/12929-3 - On-surface synthesis of tunable single layer low dimensional materials: understanding their chemical integrity, vibronic, electronic, and spin properties |
| Grantee: | Abner de Siervo |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 25/02160-2 - Unraveling the formation mechanisms of organometallic networks using STM microscopy and Raman spectroscopy (TERS) |
| Grantee: | Rafael dos Reis Barreto |
| Support Opportunities: | Scholarships in Brazil - Technical Training Program - Technical Training |
| FAPESP's process: | 24/07242-4 - Improvement of the properties of bimetallic nanoparticles for application in artificial photosynthesis |
| Grantee: | Abner de Siervo |
| Support Opportunities: | Regular Research Grants |