Vibrational spectra of 2-ethynylpyridine and its silver salt

Abstract

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 vibrational frequencies. EP interaction with a silver electrode surface was studied using the SERS effect at several applied potentials and pH. The obtained results clearly indicated that the molecule adsorption occurs through the nitrogen lone pair and the triple bond, with the molecular plane perpendicular to the metal surface. Silver acetylide is formed in neutral media when the potential is −0.7 V or more negatives.