Metal tetraphenylporphyrins (MTPPs, with M = Zn, Co) deposited on an oxygen-passivated Fe substrate, namely Fe(0 0 1)-p(1 x 1)O, were studied to understand the mechanism of molecular self-assembling on ultrathin metaloxide films. These were characterized by photoemission spectroscopy (PES) and low energy electron diffraction (LEED).Heterogeneous MTPP monolayers (ZnTPP + CoTPP) were grown at room temperature by depositing a sub-monolayer of ZnTPP on Fe(0 0 1)-p(1 x 1)O followed by a sub-monolayer of CoTPP or vice-versa, or by codeposition. Homogeneous layers are characterized by markedly different molecular superstructures, as shown by LEED. Conversely, heterogeneous monolayers reflected an even more complex behavior: in particular, it was observed that the deposition of a small amount of CoTPP before or simultaneous to the dosing of ZnTPP molecules was able to stabilize a (5 x 5)R37 degrees diffraction pattern, characteristic of homogeneous CoTPP, whereas homogeneous ZnTPP layers are associated to a straight (5 x 5) one. The observed differences in the ordering of the molecular self-assembling as a consequence of combining the two MTPPs highlights a significant influence of one MTPP over the other depending upon the central metal ion and not upon the molecular skeleton.

Porphyrin central metal ion driven self-assembling in heterogeneous ZnTPP – CoTPP films grown on Fe(0 0 1)-p(1 × 1)O

Majumdar I.;Goto F.;Calloni A.;Albani G.;Duo' L.;Finazzi M.;Ciccacci F.;Bussetti G.
2023-01-01

Abstract

Metal tetraphenylporphyrins (MTPPs, with M = Zn, Co) deposited on an oxygen-passivated Fe substrate, namely Fe(0 0 1)-p(1 x 1)O, were studied to understand the mechanism of molecular self-assembling on ultrathin metaloxide films. These were characterized by photoemission spectroscopy (PES) and low energy electron diffraction (LEED).Heterogeneous MTPP monolayers (ZnTPP + CoTPP) were grown at room temperature by depositing a sub-monolayer of ZnTPP on Fe(0 0 1)-p(1 x 1)O followed by a sub-monolayer of CoTPP or vice-versa, or by codeposition. Homogeneous layers are characterized by markedly different molecular superstructures, as shown by LEED. Conversely, heterogeneous monolayers reflected an even more complex behavior: in particular, it was observed that the deposition of a small amount of CoTPP before or simultaneous to the dosing of ZnTPP molecules was able to stabilize a (5 x 5)R37 degrees diffraction pattern, characteristic of homogeneous CoTPP, whereas homogeneous ZnTPP layers are associated to a straight (5 x 5) one. The observed differences in the ordering of the molecular self-assembling as a consequence of combining the two MTPPs highlights a significant influence of one MTPP over the other depending upon the central metal ion and not upon the molecular skeleton.
2023
File in questo prodotto:
File Dimensione Formato  
Manuscript_Majumdar_APSUSC_submitted.pdf

accesso aperto

: Pre-Print (o Pre-Refereeing)
Dimensione 1.31 MB
Formato Adobe PDF
1.31 MB Adobe PDF Visualizza/Apri
App Surf Sci Majumdar 2023.pdf

accesso aperto

: Publisher’s version
Dimensione 9.32 MB
Formato Adobe PDF
9.32 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1245458
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact