TY - JOUR
T1 - Sers investigation of interfacial Pb(II) species in weakly acidic aqueous halide media
AU - Coria-Garcia, José
AU - Pemberton, Jeanne E.
AU - Sobocinski, Raymond L.
N1 - Funding Information:
The authors gratefully acknowledge financial support of this work by the National Science Foundation (CHE-8309454). We also thank Professor Tom Furtak for providing preprints of his work on the Ag surface clusters.
PY - 1987/3/10
Y1 - 1987/3/10
N2 - Surface-enhanced Raman scattering (SERS) has been used to study surface adsorbates at Ag electrodes from weakly acidic Cl-1 and Br-1 solutions containing Pb(II). Spectra in the low-frequency region (< 300 cm-1) indicate the presence of hydroxolead(II) complexes ionically bonded to specifically absorbed halide ions at the Ag surface. Studies of the effect of pH and halide ion concentration on the measured SERS intensities suggest that the surface precipitate has a composition in the ratio Pb(II):OH-1:X-1 of 1:1:1. The underpotential deposition of Pb quenches the intensities of these bands at different rates as a function of Pb coverage. These results suggest contributions from chemical effects in SERS of these systems. Additionally, a band at 110 cm-1 grows in intensity as the first Pb monolayer is deposited on the Ag surface in Cl-1 media. This vibration is tentatively assigned as Pb-Pb stretch.
AB - Surface-enhanced Raman scattering (SERS) has been used to study surface adsorbates at Ag electrodes from weakly acidic Cl-1 and Br-1 solutions containing Pb(II). Spectra in the low-frequency region (< 300 cm-1) indicate the presence of hydroxolead(II) complexes ionically bonded to specifically absorbed halide ions at the Ag surface. Studies of the effect of pH and halide ion concentration on the measured SERS intensities suggest that the surface precipitate has a composition in the ratio Pb(II):OH-1:X-1 of 1:1:1. The underpotential deposition of Pb quenches the intensities of these bands at different rates as a function of Pb coverage. These results suggest contributions from chemical effects in SERS of these systems. Additionally, a band at 110 cm-1 grows in intensity as the first Pb monolayer is deposited on the Ag surface in Cl-1 media. This vibration is tentatively assigned as Pb-Pb stretch.
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U2 - 10.1016/0022-0728(87)85047-7
DO - 10.1016/0022-0728(87)85047-7
M3 - Article
AN - SCOPUS:0023314177
SN - 0022-0728
VL - 219
SP - 291
EP - 309
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 1-2
ER -