WorldCat Identities

University of North Carolina at Chapel Hill Department of Chemistry

Overview
Works: 27 works in 37 publications in 1 language and 120 library holdings
Roles: Researcher
Classifications: QD101.2, 545
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The energetics and dynamics of free radicals, ions, and clusters. Progress report, April 1992--March 1993 ( )
1 edition published in 1993 in English and held by 4 WorldCat member libraries worldwide
Structure and energetics of free radicals, ions, and clusters are being investigated by photoelectron photoion coincidence and analyzed using ab initio molecular orbital and statistical theory (RRKM). Molecules or free radicals are prepared in a molecular beam. Translational temperature is found from measured time of flight peakwidth; the vibrational temperature, from shift in dissociation onset. Free radicals are produced by pyrolysis in the nozzle; their subsequent cooling is demonstrated. Ion dissociation rates in the range from 10⁴ to 10⁷ s⁻¹ are measured from the asymmetric TOF distribution; this method was used to measure the dissociation rates of cold and warm butene ions. 2 figs
The energetics and dynamics of free radicals, ions, and clusters. Progress report ( )
1 edition published in 1994 in English and held by 4 WorldCat member libraries worldwide
The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with the aid of ab initio molecular orbital and statistical theory (RRKM) calculations. The two major themes are the quantitative analysis of unimolecular reactions with no adjustable parameters, and the study of cluster ion dissociation processes. Molecules (or free radicals) were prepared in a molecular beam so that they are translationally and vibrationally cold. The translational temperature was calculated from the measured time of flight (TOF) peak width, while the vibrational temperature was determined from the shift in the dissociation onset. Free radicals are produced by pyrolysis in the nozzle, and subsequent cooling of the free radicals is demonstrated. Ion dissociation rates in the range from 10⁴ to 10⁷ sec⁻¹ are measured from the asymmetric TOF distribution. This method was used to measure the dissociation rates of a number of cold and warm ions, among them HCl (DCl) loss from C₂H₅Cl (C₂D₅Cl⁺), a reaction that proceeds via tunneling. The analysis of the butene ion dissociation provided information about the role of angular momentum in dissociation reactions. This dissociative ionization of ethylene clusters demonstrated that ethylene dimer ions rearranged to butene ions prior to dissociation. Finally, a new value for the t-butyl ion heat of formation, which corrects a 15 kJ/mol error in the previous value, was obtained from the 0 K breakdown diagram of t-butyl iodide
Energy conversion based on molecular excited states Redox splitting in soluble polymers. Final report ( )
1 edition published in 1995 in English and held by 4 WorldCat member libraries worldwide
A general method was developed for preparing complexes of Ru(II) with three different bidentate ligands; it is being extended to monodentate ligands for more synthetic versatility. This method was used to prepare a series of complexes with pre-designed absorption properties, with the goal of ''black absorbers'' for use as antenna chromophores in a light-to-chemical energy conversion array. The energy gap law for nonradiative decay was studied for preparing near-IR luminophores with long excited state lifetimes. The problem of destructive dd excited states in Ru(II) polypyridyl complexes was focused on, with success in preparing an extremely photo-inert complex with monodentate pyridine ligands. Time-resolved resonance Raman and infrared spectroscopy were used to study subtle excited state properties of complexes of Ru(II), Os(II), and Re(I). Success was achieved in controlled immobilization of d⁶ chromophores and quenchers on styrenic polymers. Having perfected our synthetic technique, we have begun to optimize the ground and excited state properties such as chromophore density, dipole orientation, and lifetime
The energetics and dynamics of free radicals, ions, and clusters. Progress report, August 1, 1991--March 31, 1992 ( )
1 edition published in 1992 in English and held by 4 WorldCat member libraries worldwide
The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with ab initio molecular orbital and statistical theory RRKM calculations. In these experiments, molecules are prepared in a molecular beam so that their internal as well as translational energies are cooled to near O K. The coincidence condition between energy analyzed electrons and their corresponding ions insures that the ions are energy selected. The primary experimental information includes ionization and fragment ion appearance energies, and the ion time of flight (TOF) distributions. The latter are obtained by using the energy selected electron as a start signal and the ion as the stop signal. These types of experiments allow us to measure the ion dissociation rates in the 10⁴ to 10⁷ sec ⁻¹ range. Such ions are commonly referred to a metastable ions. In addition, the TOF peak widths are related to the release of translational energy in the ion dissociation process. Perhaps the most important advance during the past year has been in the study of cluster photoionization. We have developed an experimental method for differentiating similar mass cluster ions based on the kinetic energy of the ions measured by TOF
Reductive coupling of carbon monoxide to C₂ products. Progress report, May 1990--November 1991 ( )
1 edition published in 1991 in English and held by 3 WorldCat member libraries worldwide
Quantitative chemical analysis by Daniel C Harris ( Book )
1 edition published in 2010 in English and held by 2 WorldCat member libraries worldwide
This comprehensive introduction to the tools and techniques of analytical chemistry has been thoroughly revised to include contemporary research. This new edition has been throughly revised with increased coverage of mass spectrometry and now is partnered by a new interactive website
Indirect chelometric analysis with the aid of liquid amalgams by William G Scribner ( Book )
1 edition published in 1958 in English and held by 1 WorldCat member library worldwide
The energetics and dynamics of free radicals, ions, and clusters ( )
1 edition published in 1992 in English and held by 1 WorldCat member library worldwide
The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with ab initio molecular orbital and statistical theory RRKM calculations. In these experiments, molecules are prepared in a molecular beam so that their internal as well as translational energies are cooled to near O K. The coincidence condition between energy analyzed electrons and their corresponding ions insures that the ions are energy selected. The primary experimental information includes ionization and fragment ion appearance energies, and the ion time of flight (TOF) distributions. The latter are obtained by using the energy selected electron as a start signal and the ion as the stop signal. These types of experiments allow us to measure the ion dissociation rates in the 10⁴ to 10⁷ sec ⁻¹ range. Such ions are commonly referred to a metastable ions. In addition, the TOF peak widths are related to the release of translational energy in the ion dissociation process. Perhaps the most important advance during the past year has been in the study of cluster photoionization. We have developed an experimental method for differentiating similar mass cluster ions based on the kinetic energy of the ions measured by TOF
Charge transfer in multiple site chemical systems by Thomas J Meyer ( Book )
1 edition published in 1992 in English and held by 1 WorldCat member library worldwide
Based on support from AROD, we have investigated redox and photochemical events in polypyrrole based polymeric films, and charge transfer processes in systems containing more than one redox site covalently attached to either soluble polymer or to solid supports. Binding and electrode position of metal particles into vinyl-bipyridyl based films were also achieved. Optical and thermal electron transfer in mixed-valence dimeric systems were studied in some detail. Chromophore/quenchers in pyrrole films; Catalysis in electropolymerized films; Photochemical imaging of thin films; Monolayer assemblies; Intramolecular process
Reductive coupling of carbon monoxide to C₂ products. Progress report for the period, May 1, 1990--November 15, 1993 ( )
1 edition published in 1993 in English and held by 1 WorldCat member library worldwide
This progress report covers the two broad areas of research addressed during the period since May 1, 1990. As proposed in 1989, studies of carbyne transformations have been pursued with a variety of carbyne substituents. Perhaps the most noteworthy carbyne results are also the simplest: preparation and properties of the parent M{triple_bond}CH unit. The other topic addressed with DOE support has metal nitrene chemistry as the cornerstone. Publications with iron, tungsten and copper complexes reflect our efforts to access intermediate oxidation state metal nitrene monomers. This new thrust was a central theme of the proposal submitted in 1989, and progress to date is sufficiently encouraging that detailed plans for expanding our nitrene project are an integral part of the accompanying proposal. References in this progress report are kept to a minimum; extensive references in the papers cited here place the work in perspective relative to the literature landscape
Selective potentiometric titration of metal ions with Triethylenetetramine by Charles N Reilley ( Book )
1 edition published in 1959 in English and held by 1 WorldCat member library worldwide
Reductive coupling of carbon monoxide to C sub 2 products ( )
1 edition published in 1991 in English and held by 1 WorldCat member library worldwide
We first prepared Tp(prime)(CO)₂W{equivalent to}CH from a conversion of the cationic phosphonium carbyne Tp(prime)(CO)₂W{equivalent to}CPMe₃+ to a neutral carbene by hydride addition at carbon. Removal of PMe₃ with a Lewis acid trap yielded milligram quantities of the desired terminal carbyne. More recently we have prepared a silylcarbyne precursor which reacts with Bu₄NF in wet THF to form substantial amounts of the CH carbyne. Dimerization to form an unusual vinylidene bridged complex is a facile decomposition route which consumes the Tp(prime)(CO)₂M{equivalent to}CH monometer for both M=MO and M=W,. Preparation of other carbyne complexes has been achieved using Tp(prime)(CO)₂W{equivalent to}C-Cl as a reagent. Another carbyne derivative was synthesized from Tp(prime)(CO)₂M{equivalent to}C-Cl by adding K(CpFe(Co)₂) to displace the chloride. Organometallic products formed from the reaction of an electrophilic iron carbene complex with nitrosoarenes or azobenzene reflect net insertion of the ArN-X moiety into the Fe=CHAr bond. Cp(CO)₂Fe-O-N(Ar(prime))=CHAr+ and Cp(CO)₂FeN(Ph)-N(Pha)=CHAr+ have been isolated and spectroscopically characterized. More promising results for long term progress in building electrophilic nitrene complexes have been achieved with Group VI reagents. Simple methods for generating Tp(prime)(CO)₂W=NHR for R= Ar and Bu{sup t} are encouraging. Furthermore, removal of H⁻ from the amido ligand with either I₂ or (Ph₃C)(BF₄) provides access to cationic nitrene complexes
The energetics and dynamics of free radicals, ions, and clusters ( )
1 edition published in 1993 in English and held by 1 WorldCat member library worldwide
Structure and energetics of free radicals, ions, and clusters are being investigated by photoelectron photoion coincidence and analyzed using ab initio molecular orbital and statistical theory (RRKM). Molecules or free radicals are prepared in a molecular beam. Translational temperature is found from measured time of flight peakwidth; the vibrational temperature, from shift in dissociation onset. Free radicals are produced by pyrolysis in the nozzle; their subsequent cooling is demonstrated. Ion dissociation rates in the range from 10[sup 4] to 10[sup 7] s[sup [minus]1] are measured from the asymmetric TOF distribution; this method was used to measure the dissociation rates of cold and warm butene ions. 2 figs
Electrical methods of analysis by Charles N Reilley ( Book )
1 edition published in 1959 in English and held by 1 WorldCat member library worldwide
 
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controlled identity University of North Carolina at Chapel Hill

University of North Carolina at Chapel Hill. Dept. of Chemistry
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English (37)