Surface chemistry of alkyl amines. 1. Ethylamine and triethylamine on W(100), W(100)-(5 x 1)-C, and W(100)-(2 x 1)-O

Journal Article · Wed Sep 17 04:00:00 EDT 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00279a029· OSTI ID:5344862

Pearlstine, K A; Friend, C M

The chemistry associated with ethyl- and triethylamine adsorbed on W(100), W(100)-(5 x 1)-C, and W(100)-(2 x 1)-O surfaces has been investigated with use of temperature-programmed reaction spectroscopy and isotopic labeling methods. The reactivity and selectivity for C-C and C-N vs. C-H bond activation is altered on W(100) by the presence of the carbide and oxide overlayers and the extent of amine substitution. Irreversible decomposition predominates on W(100) at low exposures for both amines. Large ethylamine exposures yield trace quantities of CH/sub 4/ and NH/sub 3/ but no C/sub 2/-hydrocarbons on W(100). Triethylamine undergoes C-N and C-C bond cleavage reactions to produce small amounts of ethylene and methane, respectively, on W(100) at high exposure. In contrast, no C-C bond scission products are observed from (C/sub 2/H/sub 5/)/sub 3/N on W(100)-(5 x 1)-C: ethylene and acetonitrile are produced. As on clean W(100), ethylamine does not yield C/sub 2/-hydrocarbons resulting from C-N bond scission on the -(5 x 1)-C: acetonitrile is the major product from ethylamine reaction on this surface. The W(100)-(2 x 1)-O surface is inert with respect to C-H, C-N, or N-H bond scission, resulting primarily in molecular ethylamine desorption up to 550 K corresponding to a desorption energy of 33 kcal/mol.

• Research Organization: Harvard Univ., Cambridge, MA
• DOE Contract Number: FG02-84ER13289
• OSTI ID: 5344862
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:19; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ADSORPTION HEAT
AMINES
CARBON
CHEMICAL BONDS
CHEMICAL REACTIONS
DATA
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
INFORMATION
LABELLED COMPOUNDS
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENTS
TUNGSTEN