Multinitrogen Heteroaromatics Studied at Pt(lll) Surfaces by EELS, Auger Spectroscopy, and Electrochemistry: Pyrazine, Pyrimidine, Pyridazine, 1,3,5-Triazine, and Their Carboxylic Acid Derivatives

Scott A. Chaffins, John Y. Gui, Chiu Hsun Lin, Frank Lu, Ghaleb N. Salaita, Donald A. Stern, Arthur T. Hubbard

研究成果: Article

21 引文 (Scopus)

摘要

Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(lll) electrode surfaces from aqueous solutions. The adsorbates studied include pyrazine (PZ), pyrimidine (PM), pyridazine (PD), 2-pyrazinecarboxylic acid (PZCA), 2,3-pyrazinedicarboxylic acid (23PZDCA), 4-pyridazinecarboxylic acid (4PDCA), and 1,3,5-triazine (TZ). Packing densities (moles adsorbed per unit area) of each compound adsorbed from solution at controlled pH and electrode potential are measured by means of Auger spectroscopy. All of the above compounds except TZ adsorb strongly to Pt(lll). Surface vibrational spectra of these adsorbed layers are obtained by electron energy-loss spectroscopy (EELS) and are compared with either vapor- or condensed-phase infrared (IR) spectra of the parent compounds. The similarity of EELS and IR spectra indicates that the adsorbates retain their molecular structure unchanged as a result of adsorption. Adsorbed layers of these materials are stable in contact with aqueous fluoride solutions and are stable also under vacuum. The adsorbed layer is electrochemically unreactive and tends to passivate the Pt surface. Carboxylic acid substituents of these compounds interact with the Pt surface to an extent which depends upon the electrode potential. Long-range order is absent from the adsorbed layer, based upon LEED observations, although the Pt(lll) surface remains ordered. The adsorbed molecules are attached to the surface primarily through the least hindered ring nitrogen atom and are arranged in tilted-vertical orientation with the average ring-to-surface angles ranging from 73° to 86°.

原文English
頁(從 - 到)1273-1281
頁數9
期刊Langmuir
6
發行號7
DOIs
出版狀態Published - 1990 一月 1

指紋

Pyrazines
Triazines
Electron energy loss spectroscopy
pyrazines
pyrimidines
Electrochemistry
electrochemistry
Carboxylic Acids
Carboxylic acids
carboxylic acids
Auger spectroscopy
energy dissipation
Spectroscopy
electron energy
Derivatives
spectroscopy
Adsorbates
Electrodes
acids
electrodes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

引用此文

Chaffins, Scott A. ; Gui, John Y. ; Lin, Chiu Hsun ; Lu, Frank ; Salaita, Ghaleb N. ; Stern, Donald A. ; Hubbard, Arthur T. / Multinitrogen Heteroaromatics Studied at Pt(lll) Surfaces by EELS, Auger Spectroscopy, and Electrochemistry : Pyrazine, Pyrimidine, Pyridazine, 1,3,5-Triazine, and Their Carboxylic Acid Derivatives. 於: Langmuir. 1990 ; 卷 6, 編號 7. 頁 1273-1281.
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abstract = "Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(lll) electrode surfaces from aqueous solutions. The adsorbates studied include pyrazine (PZ), pyrimidine (PM), pyridazine (PD), 2-pyrazinecarboxylic acid (PZCA), 2,3-pyrazinedicarboxylic acid (23PZDCA), 4-pyridazinecarboxylic acid (4PDCA), and 1,3,5-triazine (TZ). Packing densities (moles adsorbed per unit area) of each compound adsorbed from solution at controlled pH and electrode potential are measured by means of Auger spectroscopy. All of the above compounds except TZ adsorb strongly to Pt(lll). Surface vibrational spectra of these adsorbed layers are obtained by electron energy-loss spectroscopy (EELS) and are compared with either vapor- or condensed-phase infrared (IR) spectra of the parent compounds. The similarity of EELS and IR spectra indicates that the adsorbates retain their molecular structure unchanged as a result of adsorption. Adsorbed layers of these materials are stable in contact with aqueous fluoride solutions and are stable also under vacuum. The adsorbed layer is electrochemically unreactive and tends to passivate the Pt surface. Carboxylic acid substituents of these compounds interact with the Pt surface to an extent which depends upon the electrode potential. Long-range order is absent from the adsorbed layer, based upon LEED observations, although the Pt(lll) surface remains ordered. The adsorbed molecules are attached to the surface primarily through the least hindered ring nitrogen atom and are arranged in tilted-vertical orientation with the average ring-to-surface angles ranging from 73° to 86°.",
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Multinitrogen Heteroaromatics Studied at Pt(lll) Surfaces by EELS, Auger Spectroscopy, and Electrochemistry : Pyrazine, Pyrimidine, Pyridazine, 1,3,5-Triazine, and Their Carboxylic Acid Derivatives. / Chaffins, Scott A.; Gui, John Y.; Lin, Chiu Hsun; Lu, Frank; Salaita, Ghaleb N.; Stern, Donald A.; Hubbard, Arthur T.

於: Langmuir, 卷 6, 編號 7, 01.01.1990, p. 1273-1281.

研究成果: Article

TY - JOUR

T1 - Multinitrogen Heteroaromatics Studied at Pt(lll) Surfaces by EELS, Auger Spectroscopy, and Electrochemistry

T2 - Pyrazine, Pyrimidine, Pyridazine, 1,3,5-Triazine, and Their Carboxylic Acid Derivatives

AU - Chaffins, Scott A.

AU - Gui, John Y.

AU - Lin, Chiu Hsun

AU - Lu, Frank

AU - Salaita, Ghaleb N.

AU - Stern, Donald A.

AU - Hubbard, Arthur T.

PY - 1990/1/1

Y1 - 1990/1/1

N2 - Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(lll) electrode surfaces from aqueous solutions. The adsorbates studied include pyrazine (PZ), pyrimidine (PM), pyridazine (PD), 2-pyrazinecarboxylic acid (PZCA), 2,3-pyrazinedicarboxylic acid (23PZDCA), 4-pyridazinecarboxylic acid (4PDCA), and 1,3,5-triazine (TZ). Packing densities (moles adsorbed per unit area) of each compound adsorbed from solution at controlled pH and electrode potential are measured by means of Auger spectroscopy. All of the above compounds except TZ adsorb strongly to Pt(lll). Surface vibrational spectra of these adsorbed layers are obtained by electron energy-loss spectroscopy (EELS) and are compared with either vapor- or condensed-phase infrared (IR) spectra of the parent compounds. The similarity of EELS and IR spectra indicates that the adsorbates retain their molecular structure unchanged as a result of adsorption. Adsorbed layers of these materials are stable in contact with aqueous fluoride solutions and are stable also under vacuum. The adsorbed layer is electrochemically unreactive and tends to passivate the Pt surface. Carboxylic acid substituents of these compounds interact with the Pt surface to an extent which depends upon the electrode potential. Long-range order is absent from the adsorbed layer, based upon LEED observations, although the Pt(lll) surface remains ordered. The adsorbed molecules are attached to the surface primarily through the least hindered ring nitrogen atom and are arranged in tilted-vertical orientation with the average ring-to-surface angles ranging from 73° to 86°.

AB - Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(lll) electrode surfaces from aqueous solutions. The adsorbates studied include pyrazine (PZ), pyrimidine (PM), pyridazine (PD), 2-pyrazinecarboxylic acid (PZCA), 2,3-pyrazinedicarboxylic acid (23PZDCA), 4-pyridazinecarboxylic acid (4PDCA), and 1,3,5-triazine (TZ). Packing densities (moles adsorbed per unit area) of each compound adsorbed from solution at controlled pH and electrode potential are measured by means of Auger spectroscopy. All of the above compounds except TZ adsorb strongly to Pt(lll). Surface vibrational spectra of these adsorbed layers are obtained by electron energy-loss spectroscopy (EELS) and are compared with either vapor- or condensed-phase infrared (IR) spectra of the parent compounds. The similarity of EELS and IR spectra indicates that the adsorbates retain their molecular structure unchanged as a result of adsorption. Adsorbed layers of these materials are stable in contact with aqueous fluoride solutions and are stable also under vacuum. The adsorbed layer is electrochemically unreactive and tends to passivate the Pt surface. Carboxylic acid substituents of these compounds interact with the Pt surface to an extent which depends upon the electrode potential. Long-range order is absent from the adsorbed layer, based upon LEED observations, although the Pt(lll) surface remains ordered. The adsorbed molecules are attached to the surface primarily through the least hindered ring nitrogen atom and are arranged in tilted-vertical orientation with the average ring-to-surface angles ranging from 73° to 86°.

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