Two dimensional and zero field NMR studies of coal structure: Progress report, April 1, 1987-June 31, 1987

Technical Report · Tue Dec 01 00:00:00 EST 1987

OSTI ID:5205825

Zilm, K W

This report covers the progress made on exploring some of the limitations of our ADIPSHIFT 2D NMR experiment that we have developed to determine the distribution of functional types of carbon in coals. One of the assumptions made in this methods is that molecular motion in minimal so that the C-H dipolar couplings are not partially averaged out. To investigate this aspect we have measured ADIPSHIFT patterns for paraformaldehyde at room temperature and at 77K and for 2-methyltetrahydrofuran at 77K. The same homonuclear scaling factor is found to fit both room temperature and 77K spectra indicating that motional correction for lattice modes are minimal. Furthermore we find that at 77K we can stop the methyl rotation in 2-methyltetrahydrofuran on the NMR timescale. For coals this implies that nearly any possible motional narrowing problems in the ADIPSHIFT method can be handled by going to 77K operation. 1 fig.

• Research Organization: Yale Univ., New Haven, CT (USA). Dept. of Chemistry
• DOE Contract Number: FG22-85PC80508
• OSTI ID: 5205825
• Report Number(s): DOE/PC/80508-7; ON: DE88007658
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
NUCLEAR MAGNETIC RESONANCE
STRUCTURAL CHEMICAL ANALYSIS
BOND ANGLE
CARBON
CHEMICAL BONDS
COUPLING
DEUTERIUM
FORMALDEHYDE
HYDROGEN
LOW TEMPERATURE
MOLECULAR STRUCTURE
NITROGEN 14
PROGRESS REPORT
SPECTRA
TETRAHYDROFURAN
ALDEHYDES
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
NITROGEN ISOTOPES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RESONANCE
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010600* - Coal
Lignite
& Peat- Properties & Composition