Covalent Anchoring and Interfacial Reactions of Adsorbed Porphyrins on Rutile TiO2(110)

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Adsorption of 5-monocarboxyphenyl-10,15,20-triphenylporphyrin (MCTPP) to rutile TiO2(110) at room temperature produces molecules on the surface covalently anchored through the carboxylate group, coadsorbed with hydroxyl groups. At elevated temperatures, the free-base porphyrin molecules metalate on...

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Detalles Bibliográficos
Autores principales: Wechsler, D., Fernández, C.C., Steinrück, H.-P., Lytken, O., Williams, F.J.
Formato: JOUR
Materias:
Carboxylation
Molecules
Oxide minerals
Titanium dioxide
Carboxylate groups
Covalent anchoring
Elevated temperature
Exposed to
Free base porphyrins
Hydroxyl groups
Lower temperatures
Rutile TiO2
Porphyrins
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_19327447_v122_n8_p4480_Wechsler
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Adsorption of 5-monocarboxyphenyl-10,15,20-triphenylporphyrin (MCTPP) to rutile TiO2(110) at room temperature produces molecules on the surface covalently anchored through the carboxylate group, coadsorbed with hydroxyl groups. At elevated temperatures, the free-base porphyrin molecules metalate on the surface, forming what we expect to be titanyl (Ti=O) porphyrin. The reaction is strongly coverage dependent with lower coverages metalating at lower temperatures, possibly caused by flat-lying molecules at low coverages being in closer proximity to the surface. This is in contrast to the behavior when exposed to Zn2+ ions in solution, where the coverage dependency is much less pronounced. © 2018 American Chemical Society.

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