In-situ spectroscopic studies of redox active self-assembled monolayers on gold electrode surfaces
Abstract
Monolayers of N-ethyl-N-octadecyl-4,4-bipyridinium (EOB) have been prepared on smooth gold surfaces prepared by spontaneous self-assembly of the electrochemically reduced form of the amphiphile and have been examined with in situ Fourier Transform Infrared Reflection Absorption Spectroscopy (FTIRRAS). Prominent positive-going peaks with hardly any detectable negative-going counterparts were observed in the normalized potential difference spectra of the layer in the reduced state (using as a reference the spectra for the layer in the fully oxidized state) in the region between 1100 and 1700 cm-1. In analogy with a model put forward by other workers it is proposed that the spectral bands originate from vibronically activated totally symmetric modes of EOB+ in monomeric and/or dimeric form.
- Publication:
-
Technical Report No. 70
- Pub Date:
- October 1990
- Bibcode:
- 1990cwru.rept.....B
- Keywords:
-
- Absorption Spectroscopy;
- Electrochemistry;
- Electrodes;
- Gold;
- Monomolecular Films;
- Oxidation-Reduction Reactions;
- Pyridines;
- Absorption Spectra;
- Fourier Transformation;
- Infrared Reflection;
- Infrared Spectra;
- Molecular Ions;
- Spectral Bands;
- Electronics and Electrical Engineering