pi. bonded intermediates in alcohol oxidation: Orientations of allyloxy and propargyloxy on Ag(110) by near edge x-ray absorption fine structure

Journal Article · Sat Oct 15 00:00:00 EDT 1988 · J. Chem. Phys.; (United States)

OSTI ID:6779492

Solomon, J L; Madix, R J; Stoehr, J

The orientation of allyl alcohol (CH/sub 2/ = CHCH/sub 2/OH), propargyl alcohol (CH 3/4 CCH/sub 2/OH), and their surface alkoxy groups has been examined on Ag(110) using near edge x-ray absorption fine structure (NEXAFS) measurements. The planes containing the ..pi..* orbitals of allyl alcohol and its alkoxy species, allyloxy (CH/sub 2/ = CHCH/sub 2/O-), are tilted 26 +- 4/sup 0/ and 32 +- 5/sup 0/ from the surface normal, respectively. Allyl alcohol itself shows no azimuthal ordering, but the ..pi..* orbital in allyloxy is azimuthally oriented 33 +- 15/sup 0/ from the close-packed direction ((11-bar0) azimuth). Propargyl alcohol is randomly oriented on the Ag(110) surface. Its alkoxy group, propargyloxy (CH 3/4 CCH/sub 2/O-), is strongly oriented with the triple bond axis parallel to the plane of the surface and directed along the (001) azimuth, perpendicular to the troughs. The position of the sigma* resonances indicate that no loss of the allylic hydrogen has occurred and that the double and triple bonds are slightly, but not significantly, perturbed from their normal gas phase bond lengths.

• Research Organization: Department of Chemical Engineering, Stanford University, Stanford, California 94305
• OSTI ID: 6779492
• Journal Information: J. Chem. Phys.; (United States), Vol. 89:8
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALCOHOLS
OXIDATION
REACTION INTERMEDIATES
ALIGNMENT
ORIENTATION
SILVER
SURFACE PROPERTIES
ALKOXY RADICALS
CHEMICAL BONDS
SURFACES
X-RAY SPECTROSCOPY
CHEMICAL REACTIONS
ELEMENTS
HYDROXY COMPOUNDS
METALS
ORGANIC COMPOUNDS
RADICALS
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties