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Conformational stability of some vinyl ethers and sulfides and a study of some peats by molecular spectroscopy

Thesis/Dissertation ·
OSTI ID:7042608
The Raman spectra (3500 to 40 cm/sup -1/) of gaseous and solid methyl-d/sub 3/-vinyl ether, CH/sub 2/CHOCD/sub 3/, have been recorded, and assignments are provided for the observed bands. From the temperature study of the Raman spectrum of gaseous CH/sub 2/CHOCH/sub 3/, the enthalpy difference between the low energy s-cis conformer and the high energy conformer was found to be 593 +/- 32 cm/sup -1/. The far infrared spectra of both the -d/sub 0/ and -d/sub 3/ compounds have been re-investigated at a resolution of 0.1 cm/sup -1/, and several new features have been found which were not previously reported. The potential function governing the methoxy torsion was determined as well as the barriers to interconversion. Methyl barriers were also determined. The Raman spectra (3500 to 40 cm/sup -1/) of gaseous, liquid, and solid methyl-d/sub 3/ vinyl sulfide, CH/sub 2/CHSCD/sub 3/, have been recorded, and assignments are provided for the observed bands. From the temperature study of the Raman spectrum of gaseous CH/sub 2/CHSCH/sub 3/, the enthalpy difference between the s-cis and gauche conformers was determined to be 749.7 +/- 68 cm/sup -1/. The infrared spectra (3500 to 400 cm/sup -1/) of gaseous and solid 2-methoxy propene-d/sub 0/, -d/sub 3/, and -d/sub 5/ have been recorded along with the corresponding Raman spectra (3500 to 40 cm/sup -1/) in the gaseous, liquid and solid phases. The infrared spectra of a number of tropical peat samples have been obtained. Variations in the spectra with depth of sample indicates that the lignite is remaining bu the cellulose decomposes with depth. Pyrolysis GC/FT-IR and pyrolysis GC/MS data was collected to aid in determining the identity of the decomposition products.
Research Organization:
South Carolina Univ., Columbia (USA)
OSTI ID:
7042608
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
ALKANES
ALKENES
DEUTERIUM
ENERGY SOURCES
ETHERS
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGEN ISOTOPES
INFRARED SPECTRA
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC MATTER
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PEAT
PROPYLENE
RAMAN SPECTRA
SPECTRA
STABLE ISOTOPES