Fernández CC, Franke M, Steinrück HP, Lytken O, Williams FJ (2021)
Publication Type: Journal article
Publication year: 2021
Book Volume: 37
Pages Range: 852-857
Journal Issue: 2
DOI: 10.1021/acs.langmuir.0c03197
Understanding the factors that control the demetalation of surface porphyrins at the solid-liquid interface is important as the molecular properties of porphyrins are largely determined by their metal centers. In this work, we used X-ray photoelectron spectroscopy (XPS) to follow the demetalation of Zn and Cd tetraphenylporphyrin molecules (ZnTPP and CdTPP) adsorbed as three-monolayer-thin multilayer films on Au(111), by exposing the molecular layers to acidic aqueous solutions. We found that porphyrin molecules at the solid-liquid interface are less prone to lose their metal center than molecules in solution. We propose that this behavior is due to either the incoming protons provided by the solution or the outgoing metal ion having to pass through the hydrophobic porphyrin multilayers where they cannot be solvated. Our results are relevant for the design of molecular devices based on porphyrin molecules adsorbed on solid surfaces.
APA:
Fernández, C.C., Franke, M., Steinrück, H.-P., Lytken, O., & Williams, F.J. (2021). Demetalation of Surface Porphyrins at the Solid-Liquid Interface. Langmuir, 37(2), 852-857. https://doi.org/10.1021/acs.langmuir.0c03197
MLA:
Fernández, Cynthia C., et al. "Demetalation of Surface Porphyrins at the Solid-Liquid Interface." Langmuir 37.2 (2021): 852-857.
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