Surface-Enhanced Raman Spectroscopy on Electrode Surfaces as a Tool to Characterize LUMOs of Inorganic Complexes with Two Different Ligands. The Case of the Ion Complex [Ru(bipy)2viol]+ *
✍ Scribed by Paola Corio; Joel C. Rubim
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 402 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
A spectroelectrochemical [ surface-enhanced Raman scattering (SERS) ] study of the ion complex [ Ru(bipy)
2 viol ] (bipy = 2,2º-bipyridine and viol = 1H,2H,5H-pyrimidine-2,4,5,6-tetraone-5-oxime) adsorbed on a silver electrode is presented. The SERS measurements showed that the vibrational modes of both ligands can be selectively enhanced by changing the potential applied to the electrode at a Ðxed laser excitation energy. The results indicate the presence of two di †erent metal to adsorbate photon-assisted charge-transfer processes. The Ðrst involves a density of donor states at and an acceptor state localized on the violurate ligand, and the second process involves E F an acceptor state localized on the bipy ligand. Using the SERS excitation proÐles, electronic absorption and electrochemical data, an energy diagram showing the relative positions of the donor and acceptor states of the surface complex formed by the mixed ligand complex adsorbed on a silver surface is also proposed.