Investigation of pyridine–Ag(X), aqueous solutions: SERS and Raman study supported by NMR spectroscopy
作者:Elena V. Potapkina、Anna S. Denisova、Liubov A. Myund、Artiom A. Makarov、Evgeniya M. Dem’yanchuk
DOI:10.1016/j.molstruc.2011.04.035
日期:2011.6
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. (C) 2011 Elsevier B.V. All rights reserved.