Vibrational spectra of 2-ethynylpyridine and its silver salt

2-Ethynylpyridine (EP) and its silver salt (silver 2-ethynylacetylide) were investigated using IR and Raman spectroscopies; density functional theory DFT) was also employed to calculate their equilibrium geometries and vibrat ional frequencies. EP interaction with a silver electrode surface was studied using the SERS e ffect at several applied potentials and pH. The obtained results clearly in dicated that the molecule adsorption occurs through the nitrogen lone pair and the triple bond, with the molecular plane perpendicular to the metal su rface, Silver acetylide is formed in neutral media when the potential is -0 .7 V or more negatives. (C) 2001 Elsevier Science B.V. All rights reserved.