Photochemical reactions of cis- and trans-1,2-dichloroethene adsorbed on Pd(111) and Pt(111)
The photochemical behaviors of cis- and trans-1,2-dichloroethene (DCE) adsorbed on Pd(111) and Pt(111) surfaces have been studied using electron energy loss spectroscopy (EELS). For multilayer coverage on either metal surface, irradiation of physisorbed DCE at 110 K with broad band irradiation (lambda>200 nm) results in photoisomerization, cis--trans. For monolayer coverage on Pt(111) at 110 K, photolysis of chemisorbed DCE causes loss of the two chlorine atoms to form a single hydrocarbon product, chemisorbed acetylene. Apparently, for lambda>237 nm, the chlorine atoms remain bound to the platinum surface whereas for shorter wavelengths, lambda>200 nm, the chlorine atoms leave the surface. These results are interpretable in terms of singlet excitation of the chemisorbed alkane followed by chlorine elimination on an excited singlet reaction surface. This study indicates that photochemistry of molecules chemisorbed on a metal surface is possible despite the proximity of the conducting surface. It shows that energy relaxation processes connected with this proximity are not prohibitively fast.
- Research Organization:
- Department of Chemistry and Chemical Biodynamics Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5354329
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 88:7; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Matrix-induced intersystem crossing in the photochemistry of the 1,2-dichloroethenes
Reductive transformation and sorption of cis- and trans-1,2-dichloroethene in a metallic iron-water system
Related Subjects
400102 -- Chemical & Spectral Procedures
400500* -- Photochemistry
ALKENES
CHEMICAL REACTIONS
CHEMISORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
ISOMERIZATION
METALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PALLADIUM
PHOTOCHEMICAL REACTIONS
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS