Chemistry Commons^™

The Effect Of Solvent Type On The Infrared Spectrum Of Carbon Monoxide Adsorbed At Platinum Electrodes, Mark Anderson, Daniel Blackwood, Thomas Richmond, Stanley Pons

Mark R. Anderson

The infrared spectrum of CO adsorbed on a platinum electrode from several solvents was investigated. In N-methylformamide, acetonitrile, and 1,2-dichloroethane, the infrared band attributed to linearly bonded CO had experimental Stark tuning rates of 20 cm−1/V, 22 cm−1/V, and 19 cm−1/V, respectively. For each of these solvents, the potential dependence of the band position was found to be linear for the entire potential range investigated. When methanol was the solvent, the plot of the band position versus potential had three distinctly linear portions, each with a different value for the slope. The behavior is explained in terms of the ability …

The Behavior Of The Infrared Spectrum Of Carbon Monoxide Adsorbed At Platinum Electrodes From Non-Aqueous Solvents, Mark Anderson, Daniel Blackwood, Stanley Pons

Mark R. Anderson

Electrochemical oxidation of vanadium hexacarbonyl anion, V(Co)6 in aprotic solvents results in formation of the V(0) complex which decomposes to form CO in high concentrations next to the electrode surface. As a result, CO is more rapidly adsorbed on the surface than by conventional methods. Surface reflection infrared spectroscopy shows that the potential dependent frequency shift for the infrared active bands due to CO adsorbed on platinum is 19 cm−1/V in 1,2-dichloroethane and 22 cm−1/V in acetonitrile, which are considerably less than the 30 cm−1/V observed in aqueous systems.

Surface-Enhanced Raman Study: Effect Of Ph And Electrode Potential On The Interfacial Behavior Of Some Substituted Pyridines, Mark Anderson, Daniel Evans

Mark R. Anderson

The surface-enhanced Raman spectra (SERS) provide information about the extent of protonation of the species adsorbed at the silver/aqueous solution interface. The compounds investigated were 4-pyridylcarbinol (1), 4-acetylpyridine (2), 3-pyridinecarboxaldehyde (3), isonicotinic acid (4), isonicotinamide (5), 4-benzoylpyridine (6), 4-(aminomethyl)pyridine (7) and 4-aminopyridine (8). For 1, the fraction of the adsorbed species which was protonated at -0.20 V vs. SCE varied with pH in a manner indicating stronger adsorption of the neutral than the cationic form. The fraction protonated increased at more negative potentials. Similar results were obtained with 3. For all compounds but 4, bands due to the unprotonated species …

Linkage Position In Oligosaccharides By Fast Atom Bombardment Ionization, Collision Activated Dissociation, Tandem Mass Spectrometry And Molecular Modeling, Roger A. Laine, Krishna M. Pamidimukkala, Alfred D. French, Randall W. Hall, Saeed A. Abbas, Rakesh K. Jain, Khushi L. Matta

Randall W. Hall

No abstract provided.

Surface-Enhanced Raman Study Of The Effect Of Electrode Potential And Solution Ph Upon The Interfacial Behavior Of 4-Pyridinecarboxaldehyde, Mark Anderson, Dennis Evans

Mark R. Anderson

Surface-enhanced Raman scattering (SERS) spectra were obtained at a silver electrode in aqueous solutions at potentials from -0.2 to -0.6 V vs SCE and pH 1-7. The forms of 4-pyridinecarboxaldehyde that are adsorbed parallel those present in solution. In particular, the fraction of adsorbed species that is protonated at -0.2 V varies with pH in a manner almost identical with the fraction that is protonated in bulk solution. The protonated compound exists almost completely in the hydrated form (gem-diol) in the interface just as it does in solution. At a given pH, the fraction protonated on the surface increases as …

The Effect Of Solvent Type On The Infrared Spectrum Of Carbon Monoxide Adsorbed On A Platinum Electrode, Stanley Pons, Mark Anderson, Daniel Blackwood

Mark R. Anderson

No abstract is currently available.

A Comprehensive Method To Characterize Mixed Conduction Electrolytes, Michael P. Setter, J. Bruce Wagner Jr.

Michael P. Setter

Determination of the electrical characteristics of an electrolyte is vitally important to the design of battery materials and sensors. A wide variety of parameters are available from both dc and ac measurements. Through the use of computer control and a custom multiplexor, we can perform dc polarization and ac impedance measurements on a sample, without replacing electrodes.

"The Infrared Spectra Of Carbon Monoxide Adsorbed On A Polycrystalline Platinum Electrode From Nonaqueous Solutions, Mark Anderson, Daniel Blackwood, Stanley Pons

Mark R. Anderson

No abstract is currently available.

The Aperiodic Crystal Description Of Diffusion In Concentrated Polymer Solvent Systems, Randall W. Hall

Randall W. Hall