Structures of cis- and trans-dichloroethenes adsorbed on Pt(111)
The structures of cis-1,2- and trans-1,2-dichloroethene (DCE) adsorbed on the Pt(111) surface have been examined by electron energy loss and thermal desorption spectroscopies over the temperature range 110 to 300 K. For monolayer and submonolayer coverages, the DCEs form sigma bonds to the platinum surface and assume staggered, alkane-like structures. Cis-DCE gives the gauche isomer with its most intense EEL peaks at 650 and 2985 cm/sup -1/, while the trans-DCE gives the trans conformer with its most intense peaks at 720 and 3000 cm/sup -1/. Isomerization does not occur. On warming to 160 K, the multilayer desorbs and above 200 K, dehalogenation occurs. A prominent EEL peak around 290 cm/sup -1/ shows that the chlorine atoms remain bonded to the surface. For both cis- and trans-DCE, the remainder of the EEL spectrum is that of C/sub 2/H/sub 2/ bonded to the surface in an olefinic structure signaled by prominent peaks at 770--785 and 3010--3020 cm/sup -1/.
- Research Organization:
- Department of Chemistry and Chemical Biodynamics Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5249922
- 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
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Related Subjects
400102* -- Chemical & Spectral Procedures
ALKENES
CHEMICAL REACTIONS
CHEMISORPTION
CONFORMATIONAL CHANGES
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LOSSES
HYDROCARBONS
LOSSES
METALS
MOLECULAR STRUCTURE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TRANSITION ELEMENTS