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

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Langmuir; (USA)

DOI:https://doi.org/10.1021/la00097a015· OSTI ID:6297848

Chaffins, S A; Gui, J Y; Lin, Chiu-Hsun; Lu, F; Salaita, G N; Stern, D A; Hubbard, A T ^[1]

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1. Univ. of Cincinnati, OH (USA)

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.

• OSTI ID: 6297848
• Journal Information: Langmuir; (USA), Journal Name: Langmuir; (USA) Vol. 6:7; ISSN LANGD; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
AQUEOUS SOLUTIONS
AUGER ELECTRON SPECTROSCOPY
AZINES
CARBOXYLIC ACIDS
CHEMISTRY
DATA
DISPERSIONS
ELECTROCHEMISTRY
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PYRAZINES
PYRIMIDINES
SOLUTIONS
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
TRIAZINES