Orientation of hydroquinone and benzoquinone adsorbed on platinum electrodes: Studies by reflection-absorption infrared spectroscopy

K. Peter Pang; Jay B. Benziger; Manuel P. Soriaga; Arthur T. Hubbard

doi:10.1021/j150664a028

Orientation of hydroquinone and benzoquinone adsorbed on platinum electrodes: Studies by reflection-absorption infrared spectroscopy

K. Peter Pang, Jay B. Benziger, Manuel P. Soriaga, Arthur T. Hubbard

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Abstract

The adsorption of hydroquinone and p-benzoquinone on Pt electrodes in 1 M HClO₄ has been examined by reflection-absorption infrared spectroscopy and cyclic voltammetry. At solute concentrations below 0.1 mM no spectral features were observed by RAIS in the 2700-3200-cm^-1 region. Cyclic voltammetry indicated less than a twofold increase in adsorbate coverage when the solute concentration was increased from 0.075 to 0.75 mM while the infrared spectra clearly showed four absorption bands, characteristic of diphenols. These results indicate a transition from flat to edgewise orientation of the adsorbed species. The results suggest that both hydroquinone and benzoquinone adsorbed from concentration above 0.75 mM as 2,3-η² edge-bonded diphenols. The applicability of separating the electrode from the electrolyte for spectroscopic examination is also demonstrated.

Original language	English (US)
Pages (from-to)	4583-4586
Number of pages	4
Journal	Journal of physical chemistry
Volume	88
Issue number	20
DOIs	https://doi.org/10.1021/j150664a028
State	Published - 1984

All Science Journal Classification (ASJC) codes

General Engineering
Physical and Theoretical Chemistry

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10.1021/j150664a028

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@article{5216c64339c04462b2c8b8a17290609b,

title = "Orientation of hydroquinone and benzoquinone adsorbed on platinum electrodes: Studies by reflection-absorption infrared spectroscopy",

abstract = "The adsorption of hydroquinone and p-benzoquinone on Pt electrodes in 1 M HClO4 has been examined by reflection-absorption infrared spectroscopy and cyclic voltammetry. At solute concentrations below 0.1 mM no spectral features were observed by RAIS in the 2700-3200-cm-1 region. Cyclic voltammetry indicated less than a twofold increase in adsorbate coverage when the solute concentration was increased from 0.075 to 0.75 mM while the infrared spectra clearly showed four absorption bands, characteristic of diphenols. These results indicate a transition from flat to edgewise orientation of the adsorbed species. The results suggest that both hydroquinone and benzoquinone adsorbed from concentration above 0.75 mM as 2,3-η2 edge-bonded diphenols. The applicability of separating the electrode from the electrolyte for spectroscopic examination is also demonstrated.",

author = "Pang, {K. Peter} and Benziger, {Jay B.} and Soriaga, {Manuel P.} and Hubbard, {Arthur T.}",

year = "1984",

doi = "10.1021/j150664a028",

language = "English (US)",

volume = "88",

pages = "4583--4586",

journal = "Journal of physical chemistry",

issn = "0022-3654",

publisher = "American Chemical Society",

number = "20",

}

TY - JOUR

T1 - Orientation of hydroquinone and benzoquinone adsorbed on platinum electrodes

T2 - Studies by reflection-absorption infrared spectroscopy

AU - Pang, K. Peter

AU - Benziger, Jay B.

AU - Soriaga, Manuel P.

AU - Hubbard, Arthur T.

PY - 1984

Y1 - 1984

N2 - The adsorption of hydroquinone and p-benzoquinone on Pt electrodes in 1 M HClO4 has been examined by reflection-absorption infrared spectroscopy and cyclic voltammetry. At solute concentrations below 0.1 mM no spectral features were observed by RAIS in the 2700-3200-cm-1 region. Cyclic voltammetry indicated less than a twofold increase in adsorbate coverage when the solute concentration was increased from 0.075 to 0.75 mM while the infrared spectra clearly showed four absorption bands, characteristic of diphenols. These results indicate a transition from flat to edgewise orientation of the adsorbed species. The results suggest that both hydroquinone and benzoquinone adsorbed from concentration above 0.75 mM as 2,3-η2 edge-bonded diphenols. The applicability of separating the electrode from the electrolyte for spectroscopic examination is also demonstrated.

AB - The adsorption of hydroquinone and p-benzoquinone on Pt electrodes in 1 M HClO4 has been examined by reflection-absorption infrared spectroscopy and cyclic voltammetry. At solute concentrations below 0.1 mM no spectral features were observed by RAIS in the 2700-3200-cm-1 region. Cyclic voltammetry indicated less than a twofold increase in adsorbate coverage when the solute concentration was increased from 0.075 to 0.75 mM while the infrared spectra clearly showed four absorption bands, characteristic of diphenols. These results indicate a transition from flat to edgewise orientation of the adsorbed species. The results suggest that both hydroquinone and benzoquinone adsorbed from concentration above 0.75 mM as 2,3-η2 edge-bonded diphenols. The applicability of separating the electrode from the electrolyte for spectroscopic examination is also demonstrated.

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DO - 10.1021/j150664a028

M3 - Article

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EP - 4586

JO - Journal of physical chemistry

JF - Journal of physical chemistry

IS - 20

ER -

Orientation of hydroquinone and benzoquinone adsorbed on platinum electrodes: Studies by reflection-absorption infrared spectroscopy

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