The Surface Enhanced Raman Scattering of the Protonated Forms of DABCO at a Silver Electrode
Abstract
The Surface Enhanced Raman Spectra of the aliphatic diamine 1.4 diazabicyclo2.2.2octane (DABCO) from a silver electrode have been measured as a function of the bulk solution pH. The SER spectrum of the diprotonated DABCO molecule at pH = 1.8 is almost identical to the normal Raman spectrum of the bulk solution at the same pH, in contrast to the SER spectrum of the unprotonated DABCO molecule at pH=12, which shows large differences from the spectrum of the bulk solution at pH = 12. It is proposed that the diprotonated DABCO molecule is co-adsorbed with specifically adsorbed anions, e.g. CT, and that its spectrum is enhanced by the electromagnetic enhancement mechanism alone. At intermediate pH values, all three possible forms (di, mono and unprotonated) of DABCO are observed, in amounts strongly dependent upon the electrode potential. Both band deconvolution and factor analysis were used to quantify relative populations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 08, 1988
- Accession Number
- ADA197930
Entities
People
- David A. Guzonas
- Donald E. Irish
- George F. Atkinson
Organizations
- University of Waterloo