Abstract
Surface vibrational states (electron energy-loss spectroscopy, EELS), molecular packing density (Auger spectroscopy) and adsorbed layer electrochemical reactivity (cyclic voltammetry) were investigated for the following unsaturated alcohols adsorbed from neat liquids and aqueous solutions at Pt (111): benzyl alcohol (BZA); 4-pyridylcarbinol (4PDC); 3-pyridylcarbinol (3PDC); allyl alcohol (AAL); propargyl alcohol (PGA); cis-2-butene-1,4-diol (CBED); and 2-butyne-1,4-diol (BYD). Chemisorption of the unsaturated centers of these alcohols is the principal mode of surface attachment (phenyl, pyridyl, CC or CC). Electrochemical oxidation of adsorbed BZA, AAL. PGA, CBED and BYD in aqueous fluoride electrolyte proceeds efficiently to CO2, while adsorbed 4PDC and 3PDC are relatively inert. The adsorbed layer of each of these alcohols is stable in vacuum, such that surface spectroscopic methods in vacuum are directly applicable to the liquid/solid interfacial chemistry and electrochemistry of these compounds. 4PDC and 3PDC are adsorbed in a tilted vertical orientation with an angle near 70° between the pyridine ring and the Pt surface. The C-C bond-order for PGA and BYD is reduced dramatically to near that of a double bond as a result of the adsorption process. The aromatic or alkene moieties of BZA, 4PDC, 3PDC, AAL and CBED are retained and only small shifts in their vibrational frequencies are found. Ordered layers of these adsorbed alcohols were not found by LEED, although uniform molecular orientation is suggested by the packing density data and voltammetric behavior.
| Original language | English |
|---|---|
| Pages (from-to) | 169-188 |
| Number of pages | 20 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 252 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1988 Oct 10 |
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All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Chemical Engineering(all)
- Electrochemistry
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Studies of adsorbed unsaturated alcohols at well-defined Pt (111) electrode surfaces by cyclic voltammetry assisted by vibrational spectroscopy (EELS). / Gui, John Y.; Kahn, Bruce E.; Lin, Chiu Hsun; Lu, Frank; Salaita, Ghaleb N.; Stem, Donald A.; Zapien, Donald C.; Hubbard, Arthur T.
In: Journal of Electroanalytical Chemistry, Vol. 252, No. 1, 10.10.1988, p. 169-188.Research output: Contribution to journal › Article
TY - JOUR
T1 - Studies of adsorbed unsaturated alcohols at well-defined Pt (111) electrode surfaces by cyclic voltammetry assisted by vibrational spectroscopy (EELS)
AU - Gui, John Y.
AU - Kahn, Bruce E.
AU - Lin, Chiu Hsun
AU - Lu, Frank
AU - Salaita, Ghaleb N.
AU - Stem, Donald A.
AU - Zapien, Donald C.
AU - Hubbard, Arthur T.
PY - 1988/10/10
Y1 - 1988/10/10
N2 - Surface vibrational states (electron energy-loss spectroscopy, EELS), molecular packing density (Auger spectroscopy) and adsorbed layer electrochemical reactivity (cyclic voltammetry) were investigated for the following unsaturated alcohols adsorbed from neat liquids and aqueous solutions at Pt (111): benzyl alcohol (BZA); 4-pyridylcarbinol (4PDC); 3-pyridylcarbinol (3PDC); allyl alcohol (AAL); propargyl alcohol (PGA); cis-2-butene-1,4-diol (CBED); and 2-butyne-1,4-diol (BYD). Chemisorption of the unsaturated centers of these alcohols is the principal mode of surface attachment (phenyl, pyridyl, CC or CC). Electrochemical oxidation of adsorbed BZA, AAL. PGA, CBED and BYD in aqueous fluoride electrolyte proceeds efficiently to CO2, while adsorbed 4PDC and 3PDC are relatively inert. The adsorbed layer of each of these alcohols is stable in vacuum, such that surface spectroscopic methods in vacuum are directly applicable to the liquid/solid interfacial chemistry and electrochemistry of these compounds. 4PDC and 3PDC are adsorbed in a tilted vertical orientation with an angle near 70° between the pyridine ring and the Pt surface. The C-C bond-order for PGA and BYD is reduced dramatically to near that of a double bond as a result of the adsorption process. The aromatic or alkene moieties of BZA, 4PDC, 3PDC, AAL and CBED are retained and only small shifts in their vibrational frequencies are found. Ordered layers of these adsorbed alcohols were not found by LEED, although uniform molecular orientation is suggested by the packing density data and voltammetric behavior.
AB - Surface vibrational states (electron energy-loss spectroscopy, EELS), molecular packing density (Auger spectroscopy) and adsorbed layer electrochemical reactivity (cyclic voltammetry) were investigated for the following unsaturated alcohols adsorbed from neat liquids and aqueous solutions at Pt (111): benzyl alcohol (BZA); 4-pyridylcarbinol (4PDC); 3-pyridylcarbinol (3PDC); allyl alcohol (AAL); propargyl alcohol (PGA); cis-2-butene-1,4-diol (CBED); and 2-butyne-1,4-diol (BYD). Chemisorption of the unsaturated centers of these alcohols is the principal mode of surface attachment (phenyl, pyridyl, CC or CC). Electrochemical oxidation of adsorbed BZA, AAL. PGA, CBED and BYD in aqueous fluoride electrolyte proceeds efficiently to CO2, while adsorbed 4PDC and 3PDC are relatively inert. The adsorbed layer of each of these alcohols is stable in vacuum, such that surface spectroscopic methods in vacuum are directly applicable to the liquid/solid interfacial chemistry and electrochemistry of these compounds. 4PDC and 3PDC are adsorbed in a tilted vertical orientation with an angle near 70° between the pyridine ring and the Pt surface. The C-C bond-order for PGA and BYD is reduced dramatically to near that of a double bond as a result of the adsorption process. The aromatic or alkene moieties of BZA, 4PDC, 3PDC, AAL and CBED are retained and only small shifts in their vibrational frequencies are found. Ordered layers of these adsorbed alcohols were not found by LEED, although uniform molecular orientation is suggested by the packing density data and voltammetric behavior.
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U2 - 10.1016/0022-0728(88)85080-0
DO - 10.1016/0022-0728(88)85080-0
M3 - Article
AN - SCOPUS:0001000436
VL - 252
SP - 169
EP - 188
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0368-1874
IS - 1
ER -