Surface-Enhanced Raman Spectroscopy as a Probe of Adsorbate-Surface Bonding: Simple Alkenes and Alkynes Adsorbed at Gold Electrodes
Abstract
The interaction of various alkenes with gold electrodes has been studied using surface-enhanced Raman spectroscopy (SERS). Large decreases, from 70 to 140/cm, were observed in the C-C double bond and C triple bond C stretching frequencies upon adsorption which are attributed to adsorbate-surface bonding involving these groups. The potential dependence of these SERS frequencies suggests that the Pi yield s (sigma band) overlap is more prevalent than the d yields pi* (pi bond) interaction. Carbon-hydrogen stretching vibrations, nu(C-H), as well as other skeletal modes were also detected for the adsorbates; paraffinic, olefinic, and aromatic nu(C-H) modes could readily be distinguished although acetylenic nu(CH) modes were too weak to be detected. Generally, the most intense SERS bands relative to those in the bulk-phase spectra are associated with vibrations of the carbon-carbon double or triple bonds. Attempts to examine SERS of adsorbated acetylene were thwarted by a spontaneous surface reaction yielding a film of polyacetylene.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1985
- Accession Number
- ADA160033
Entities
People
- M. L. Patterson
- Michael J. Weaver
Organizations
- Purdue University