Accession Number : ADA189140

Title :   A Study of the Gold/Cyanide Solution Interphase by In-Situ Polarization Modulated FT IRRAS (Fourier Transform Infrared Reflection Absorption Spectroscopy).

Descriptive Note : Technical rept.,

Corporate Author : IBM ALMADEN RESEARCH CENTER SAN JOSE CA

Personal Author(s) : Kunimatsu, K ; Seki, H ; Golden, W G ; Gordon, J G , II ; Philpott, M R

PDF Url : ADA189140

Report Date : Nov 1987

Pagination or Media Count : 22

Abstract : Polarization modulated Fourier transform infrared reflection absorption spectroscopy (FT-IR-RAS) is used to study the interphase between polycrystalline gold electrodes and 0.5 M K2SO4 solution as a function of potential and CN(-) concentration. Surface cyanide species, adsorbed on the gold electrode, give rise to a C-N stretching band at 2105/cm at -1.0V (Ag/AgC1) which undergoes a shift of approximately 30/cm/V to higher wavenumber at more positive potentials. The species is identified as linearly adsorbed CN(-) ions. The Au(CN)2- complex, which gives rise to a C-N stretching mode at -1.0 V(Ag/AgC1) is less than ca. 10/cm from low coverage to saturation coverage. Experiments using isotopic mixtures of 12CN and 13CN show that this shift is due to direct lateral interactions between adsorbed cyanide ions. Keywords: Infrared, Vibrational spectroscopy, Electrochemistry, Gold, Cyanide.

Descriptors :   *ADSORPTION, *CYANIDES, *ELECTRODES, *GOLD, *IONS, ELECTROCHEMISTRY, PHASE STUDIES, POLYCRYSTALLINE, SATURATION, SPECTROSCOPY, SURFACES, VIBRATIONAL SPECTRA, SOLUTIONS(MIXTURES), FOURIER SPECTROSCOPY, INFRARED SPECTROSCOPY, POTASSIUM COMPOUNDS, SULFATES

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE