Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface
Demetalation of zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) under acidic conditions and ion exchange with Cu2+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 exchang...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09476539_v22_n25_p8520_Franke http://hdl.handle.net/20.500.12110/paper_09476539_v22_n25_p8520_Franke |
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paper:paper_09476539_v22_n25_p8520_Franke2023-06-08T15:53:58Z Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface ion exchange metalation porphyrins solid–liquid interfaces zinc Ions Liquids Phase interfaces Porphyrins Solutions Zinc Zinc compounds Acidic conditions Au(111) surfaces Free base porphyrins Metal centers Metalations Rapid reactions Solid-liquid interfaces Zinc porphyrins Ion exchange Demetalation of zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) under acidic conditions and ion exchange with Cu2+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 Zn2+ions could not be achieved. The preference for copper is so strong that even an attempt to exchange adsorbed ZnTPP with Ni2+ions in the presence of traces of Cu2+yielded CuTPP rather than NiTPP. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09476539_v22_n25_p8520_Franke http://hdl.handle.net/20.500.12110/paper_09476539_v22_n25_p8520_Franke |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ion exchange metalation porphyrins solid–liquid interfaces zinc Ions Liquids Phase interfaces Porphyrins Solutions Zinc Zinc compounds Acidic conditions Au(111) surfaces Free base porphyrins Metal centers Metalations Rapid reactions Solid-liquid interfaces Zinc porphyrins Ion exchange |
| spellingShingle |
ion exchange metalation porphyrins solid–liquid interfaces zinc Ions Liquids Phase interfaces Porphyrins Solutions Zinc Zinc compounds Acidic conditions Au(111) surfaces Free base porphyrins Metal centers Metalations Rapid reactions Solid-liquid interfaces Zinc porphyrins Ion exchange Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| topic_facet |
ion exchange metalation porphyrins solid–liquid interfaces zinc Ions Liquids Phase interfaces Porphyrins Solutions Zinc Zinc compounds Acidic conditions Au(111) surfaces Free base porphyrins Metal centers Metalations Rapid reactions Solid-liquid interfaces Zinc porphyrins Ion exchange |
| description |
Demetalation of zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) under acidic conditions and ion exchange with Cu2+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 Zn2+ions could not be achieved. The preference for copper is so strong that even an attempt to exchange adsorbed ZnTPP with Ni2+ions in the presence of traces of Cu2+yielded CuTPP rather than NiTPP. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| title |
Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| title_short |
Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| title_full |
Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| title_fullStr |
Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| title_full_unstemmed |
Zinc Porphyrin Metal-Center Exchange at the Solid–Liquid Interface |
| title_sort |
zinc porphyrin metal-center exchange at the solid–liquid interface |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09476539_v22_n25_p8520_Franke http://hdl.handle.net/20.500.12110/paper_09476539_v22_n25_p8520_Franke |
| _version_ |
1768545236408074240 |