Zinc Porphyrin Metal-Center Exchange at the Solid-Liquid Interface

Franke M, Marchini F, Jux N, Steinrück HP, Lytken O, Williams FJ (2016)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Publisher: Wiley-VCH Verlag

Book Volume: 22

Pages Range: 8520-8524

Journal Issue: 25

DOI: 10.1002/chem.201600634

Abstract

Demetalation of zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) under acidic conditions and ion exchange with Cu ions at neutral pH are both rapid reactions in the liquid medium. However, for ZnTPP monolayers adsorbed on a Au(111) surface exposed to aqueous solution, we find that, although ion exchange takes place rapidly as expected, demetalation does not occur, even at pH values as low as 0. Based on this, we conclude that metal center exchange on the surface does not proceed through a free-base porphyrin as an intermediate. Furthermore, once formed, CuTPP is stable on the surface and the reverse exchange from CuTPP to ZnTPP in the presence of Zn ions could not be achieved. The preference for copper is so strong that even an attempt to exchange adsorbed ZnTPP with Ni ions in the presence of traces of Cu yielded CuTPP rather than NiTPP.

Authors with CRIS profile

Involved external institutions

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

How to cite

APA:

Franke, M., Marchini, F., Jux, N., Steinrück, H.-P., Lytken, O., & Williams, F.J. (2016). Zinc Porphyrin Metal-Center Exchange at the Solid-Liquid Interface. Chemistry - A European Journal, 22(25), 8520-8524. https://dx.doi.org/10.1002/chem.201600634

MLA:

Franke, Matthias, et al. "Zinc Porphyrin Metal-Center Exchange at the Solid-Liquid Interface." Chemistry - A European Journal 22.25 (2016): 8520-8524.

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