| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1406242 | Journal of Molecular Structure | 2011 | 7 Pages |
The Ag–pyridine system has been investigated by Surface Enhanced Raman spectroscopy (SERS), Raman and Nuclear Magnetic Resonance (NMR) spectroscopy. Raman and NMR spectroscopy data concerning the formation of a pyridine complex with silver cations in the solution bulk have been used to explain the nature of a band at 1025 cm−1 appearing in the SERS spectrum at the anode etching of a silver electrode. The existence of two complexes of different stoichiometric composition Ag(py)+ and Ag(py)2+, has been confirmed. The distribution of pyridine forms at Ag:py mole ratios from 0 to 6 has been obtained from the analysis of the intensities of individual components of the Raman spectrum. Both types of complexes have been shown to exist in solution at equimolar 1:1 ratio. It has been assumed that a complex of 1:1 composition will be adsorbed at the excess of Ag+ ions near the surface.
► Formation of two types of complexes is possible in the Ag–pyridine aqueous system. ► At Ag:py mole ratio less then 1 Ag(py)2+ form dominates. ► At Ag:py mole ratio more then 1 Ag(py)+ form dominates. ► Band 1025 cm−1 in SERS spectrum of pyridine corresponds to adsorbed complex Ag(py)+.
