Interaction of formamide with the Ru(001)-p(1x2)-O surface

Journal Article · Wed Aug 19 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00251a005· OSTI ID:6043203

Parmeter, J E; Schwalke, U; Weinberg, W H

The adsorption and decomposition of formamide on a Ru(001) surface on which is present an ordered p(1x2) overlayer of oxygen adatoms have been studied with electron energy loss spectroscopy and thermal desorption mass spectrometry. Below 260 K, formamide is chemisorbed molecularly on this surface, with two different forms existing above and below 225 K, independent of coverage. The form present below 225 K bonds to the surface via an electron lone pair of the formamide oxygen atom, while the form present above 225 K bonds to the surface via electron lone pairs on both the oxygen and nitrogen atoms. Annealing to 260 K results in the partial decomposition of the chemisorbed formamide to an eta/sup 2/(N,O)-NHCHO species, analogous to eta/sup 2/-formates that have been identified on transition-metal surfaces and in organometallic compounds. For sufficiently high initial formamide coverages, the chemical conversions occurring at both 225 and 260 K are accompanied by some desorption of molecular formamide. The eta/sup 2/(N,O)-NHCHO decomposes near 420 K, evolving H/sub 2/ and CO, and leaving nitrogen adatoms on the surface. The nitrogen adatoms recombine and desorb near 570 K, leaving the p(1x2)-O overlayer intact on the surface. Following a saturation formamide exposure, approximately 0.05 monolayer of eta/sup 2/(N,O)-NHCHO forms and decomposes on this surface.

• Research Organization: California Institute of Technology, Pasadena
• OSTI ID: 6043203
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:17; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMIDES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DECOMPOSITION
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
EXPERIMENTAL DATA
FORMAMIDE
HIGH TEMPERATURE
INFORMATION
LOW TEMPERATURE
MASS SPECTROSCOPY
MEDIUM TEMPERATURE
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS