Multinitrogen heteroaromatics studied at Pt(111) surfaces by EELS, Auger spectroscopy, and electrochemistry: pyrazine, pyrimidine, pyridazine, 1,3,5-triazine, and their carboxylic acid derivatives

Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(111) electrode surfaces from aqueous solutions. The adsorbates studied include pyrazine (PZ), pyrimidine (PM), pyridazine (PD), 2-pyrazinecarbo...

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Bibliographic Details
Published in:Langmuir 1990-07, Vol.6 (7), p.1273-1281
Main Authors: Chaffins, Scott A, Gui, John Y, Lin, Chiu Hsun, Lu, Frank, Salaita, Ghaleb N, Stern, Donald A, Hubbard, Arthur T
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
ADSORPTION
AQUEOUS SOLUTIONS
AUGER ELECTRON SPECTROSCOPY
AZINES
CARBOXYLIC ACIDS
CHEMISTRY
DATA
DISPERSIONS
ELECTROCHEMISTRY
Electrodeposition
ELECTRON SPECTROSCOPY
ELEMENTS
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
HETEROCYCLIC COMPOUNDS
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PYRAZINES
PYRIMIDINES
SOLUTIONS
SORPTION
SPECTROSCOPY
Study of interfaces
SURFACE PROPERTIES
TRANSITION ELEMENTS
TRIAZINES
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Summary:Reported here are surface electrochemical studies of several multinitrogen heteroaromatics and their carboxylic acid derivatives adsorbed at well-defined Pt(111) 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(111). 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.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00097a015