Temperature and pressure dependence of hydrogen bonding in liquid methanol studied by nuclear magnetic resonance
- State Univ. College at Buffalo, NY (USA)
Measurements of high pressure nuclear magnetic resonance chemical shift data, as a function of temperature and pressure over the temperature range 278-392 K and pressure range 0.1-100 MPa, add to the understanding of the liquid state of methanol. The thermodynamic parameters of association for a monomer-tetramer equilibrium model of liquid methanol were determined. The experimentally determined values for {Delta}H, {Delta}V, and {Delta}S of {minus}51 {plus minus} 7 KJ/mol, {minus}11 {plus minus} 2 cm{sup {minus}2}/mol and {minus}195 {plus minus} 30 J/(mol K), respectively, are physically reasonable for the monomer-tetramer equilibrium model of association. Interpretation of the thermodynamic parameters of association from NMR chemical shift data is shown to be more reliable than NMR spin-echo data in reflecting the effect of pressure on the hydrogen-bond network.
- OSTI ID:
- 5490003
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 94:18; ISSN JPCHA; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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10 SYNTHETIC FUELS
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ALCOHOLS
FLUIDS
HYDROXY COMPOUNDS
LIQUIDS
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
METHANOL
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RESONANCE
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES