Demetalation of Surface Porphyrins at the Solid-Liquid Interface

Fernández CC, Franke M, Steinrück HP, Lytken O, Williams FJ (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Langmuir American Chemical Society

Book Volume: 37

Pages Range: 852-857

Journal Issue: 2

DOI: 10.1021/acs.langmuir.0c03197

Abstract

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.

Authors with CRIS profile

Matthias Franke Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II Ole Lytken Lehrstuhl für Physikalische Chemie II

Involved external institutions

Universidad de Buenos Aires (UBA) / University of Buenos Aires AR Argentina (AR)

How to cite

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://dx.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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