Molecularly resolved studies of the reaction of pyridine and dimethylamine with oxygen at a Cu(110) surface

Carley, Albert Frederick, Davies, Philip Rosser ORCID: https://orcid.org/0000-0003-4394-766X, Edwards, Dyfan, Jones, Rhys Vaughan and Parsons, Martin 2005. Molecularly resolved studies of the reaction of pyridine and dimethylamine with oxygen at a Cu(110) surface. Topics in Catalysis 36 (1-4) , pp. 21-32. 10.1007/s11244-005-7859-1

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Abstract

Pyridine and dimethylamine have been studied at clean and oxidised Cu(110) surfaces as model systems for the interaction of amines with heterogeneous catalysts using scanning tunnelling microscopy and X-ray photoelectron spectroscopy. Both molecules interact strongly with sub monolayer concentrations of chemisorbed oxygen causing a change from the well known p(2×1)O(a) islands to a (3×1) structure. XPS shows a 1:1 correspondence between the concentration of surface oxygen and that of chemisorbed pyridine but the stoichiometry of the dimethylamine/oxygen system could not be directly measured because of a slow reaction which results in the desorption of oxygen as water and the formation of a chemisorbed amide. The amide also decomposes at room temperature and desorbs leaving a clean surface. However, the 2:1 stoichiometry of the dimethylamine/oxygen reaction suggests a 1:1 dimethylamine:oxygen ratio in the (3×1) structure. The results of the study are interpreted in terms of an amine–oxygen complex, which may provide a general model for the interaction of amines with oxygen at metal surfaces.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	dimethylamine - pyridine - XPS - STM - amide - surface - Cu(110), amine oxide
Publisher:	Springer
ISSN:	1022-5528
Last Modified:	17 Oct 2022 08:54
URI:	https://orca.cardiff.ac.uk/id/eprint/1415

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