Carboxylic Acid Deprotonation on the Ag(110) and Ag(111) Surfaces

Autor:	Andrew J. Gellman, Bryan Parker, Boonchuan Immaraporn
Rok vydání:	2001
Předmět:	chemistry.chemical_classification Carboxylic acid Inorganic chemistry Surfaces and Interfaces Condensed Matter Physics Decomposition Chain length Adsorption Deprotonation Hydrocarbon chemistry Desorption Electrochemistry General Materials Science Spectroscopy Alkyl
Zdroj:	Langmuir. 17:6638-6646
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la011103d
Popis:	The surface chemistry of hydrocarbon carboxylic acids has been compared with that of perfluorinated carboxylic acids on the Ag(110) and Ag(111) surfaces. The hydrocarbon acids adsorb reversibly on the clean silver surfaces. On Ag(110) their desorption energies increase linearly with increasing alkyl chain length (n) and are given by the expression ΔEdes = 10.6 + 0.9n kcal/mol. The surface chemistry of the perfluorinated acids is quite different from that of the hydrocarbon acids in the sense that they deprotonate to form perfluorocarboxylate species on both Ag(110) and Ag(111) surfaces. The perfluorocarboxylates are stable until the surface temperature reaches ∼620 K, at which point they decompose yielding desorption of CO2 and other decomposition fragments. On both Ag surfaces 2,2,2-trifluoroacetate (CF3CO2) generated by deprotonation of 2,2,2-trifluoroacetic acid (CF3CO2H) has been identified by its vibrational spectrum. The fact that fluorinated acids deprotonate on the Ag surfaces while the hydrocarbo...
Databáze:	OpenAIRE
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