Author
W.J. Potts
Bio: W.J. Potts is an academic researcher from Dow Chemical Company. The author has contributed to research in topics: Infrared spectroscopy & Dithiol. The author has an hindex of 6, co-authored 6 publications receiving 431 citations.
Papers
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TL;DR: In this article, various infrared absorption group frequency correlations for out-of-plane hydrogen deformations of substituted ethylenes are reviewed, and it is shown that the CH 2 wag motion of vinyl and vinylidene type substituted polyethylenes behave in an analogous manner.
101 citations
TL;DR: In this article, the infrared spectra of a variety of acetylenic compounds have been obtained and the behavior of various frequencies characteristic of the -C-C-H group ( C-H stretch, ~3315 cm−1; C-C stretch, ∼2130 cm− 1, C -C stretch, approximately 1000 cm−
80 citations
TL;DR: The effects of chemical structure on the carbonyl stretching frequencies of thiol esters are discussed in this paper, and shown to be generally similar, with certain modifications, to the corresponding effects upon ordinary ester carbonyls frequencies.
71 citations
TL;DR: In this article, the behavior of these frequencies in the various compounds can be related and explained by considering the vibrations to be roughly analogous to those of the carbonyl dihalides.
68 citations
TL;DR: In this article, a complete assignment of the fundamental vibration frequencies of ethylene imine has been made based on vapor phase band contours, frequency shifts resulting from concentration changes, the Raman spectrum and polarizations, and analogies to ethylene oxide.
62 citations
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TL;DR: The laser-Raman spectrum of poly(methyl methacrylate) complete with depolarization data is reported in this article, and a spectrum of powdered poly(ethyl methacric acid) is also given for reference purposes.
234 citations
TL;DR: The photo-oxidative stability of a series of commercial acrylic/methacrylic protective resins, which find use in consolidation and protection of art works, monuments and historical buildings, and are known by the name of Paraloids, has been investigated.
231 citations
TL;DR: In this article, the electronic states of cyclopropane, ethylene oxide, ethylenimine, and diaziridine were investigated using gas phase and condensed phase vacuum ultraviolet spectroscopy, photoelectron spectrographs, and Gaussian orbital self-consistent field calculations.
Abstract: The electronic states of cyclopropane, ethylene oxide, ethylenimine, and diaziridine were investigated using gas‐phase and condensed‐phase vacuum ultraviolet spectroscopy, photoelectron spectroscopy, and Gaussian orbital self‐consistent field calculations. Correlation of the gas‐phase and condensed‐phase optical spectra of cyclopropane with the first band in its photoelectron spectrum confirms the presence of Rydberg transitions in the optical spectrum involving excitation of an electron from the 3e′ sigma level. The valence shell spectrum of cyclopropane is complex but is dominated by two very strong 1A1′ → 1E′, σ → σ*, excitations. The Rydberg spectrum of ethylene oxide is reassigned to include the two absorptions in the 55 000–65 000‐cm−1 region, all bands originating from the 2b2π orbital, while its valence shell spectrum is closely related to that of cyclopropane. Similar but less conclusive results were obtained for ethylenimine. Virtual orbital calculations of σ → σ* excitation energies gave result...
216 citations
TL;DR: In this paper, the Urey-Bradley force field is not satisfactory unless it is augmented with some valence-force interaction constants, and the most probable force field indicates a decrease in the value of KCO in going from formaldehyde to acetaldehyde.
Abstract: Normal‐coordinate calculations have been carried out for the molecules acetone, acetone‐d6, acetaldehyde, acetaldehyde‐d4, acetaldehyde‐d1, formaldehyde, and formaldehyde‐d2. Infrared and Raman spectra for acetone, acetone‐d6, and acetaldehyde‐d4 were measured and assigned. Together with experimental data and assignments taken from the literature for the other molecules, these yield an almost complete set of fundamental frequencies.These frequencies were used to derive approximate force fields for these molecules and to investigate the transferability of the force constants. Calculations were carried out with both the Urey—Bradley force field (UBFF) and the valence‐force field (VFF) with selected interaction constants. The Urey—Bradley force field is not satisfactory unless it is augmented with some valence‐force interaction constants. In the valence‐force approximation it is not possible to make an unambiguous choice of the nondiagonal constants. However, a most probable force field is indicated, which on the one hand reproduces the experimental frequencies and on the other hand shows reasonable values for diagonal and nondiagonal force constant.The CO stretching constant, KCO, and the force constants around the CO group appear to be nontransferable among these molecules. The most probable force field indicates a decrease in the value of KCO in going from formaldehyde to acetaldehyde, to acetone. It is noted that the choice of interaction constants has a great influence on the values of the diagonal force constants and on the normal coordinates. Anharmonicity effects are also found to influence the values of the force constants and may affect the resulting conclusions.
190 citations
163 citations