Variable Composition of the Chlorine and Ethylene Oxide Clathrate Hydrates

1966 ◽  
Vol 44 (4) ◽  
pp. 1710-1711 ◽  
Author(s):  
D. N. Glew ◽  
N. S. Rath
Keyword(s):  
Ethylene Oxide ◽  
Clathrate Hydrates ◽  
Variable Composition

Polyhedral Clathrate Hydrates. IX. Structure of Ethylene Oxide Hydrate

1965 ◽  
Vol 42 (8) ◽  
pp. 2725-2732 ◽  
Author(s):  
Richard K. McMullan ◽  
G. A. Jeffrey
Keyword(s):  
Ethylene Oxide ◽  
Clathrate Hydrates ◽  
Oxide Hydrate

Far infrared absorption and rotational vibrations of the guest molecules in structure I clathrate hydrates between 4.3 and 100 K

1977 ◽  
Vol 55 (10) ◽  
pp. 1777-1785 ◽  
Author(s):  
John E. Bertie ◽  
Stephen M. Jacobs
Keyword(s):  
Ethylene Oxide ◽  
Guest Molecule ◽  
Signal To Noise Ratio ◽  
Michelson Interferometer ◽  
Far Infrared ◽  
Force Constants ◽  
Clathrate Hydrates ◽  
High Signal ◽  
Guest Molecules ◽  
Trimethylene Oxide

The infrared spectra between 330 and 15 cm−1 of the structure I clathrate hydrates of ethylene oxide, cyclopropane, and trimethylene oxide, at 4.3 K are presented. The spectra have an unusually high signal-to-noise ratio made possible by a Michelson interferometer and a silicon bolometer detector which operates at 1.2 K. Rotational vibrations of the guest molecules were observed at 65.0 and 35.6 cm−1 for ethylene oxide and at 69 and 50 cm−1 for trimethylene oxide. Inter-guest coupling of rotational vibrations is small and the two frequencies are assigned to vibrations about different inertial axes. The resulting force constants are 487 and 264 ferg rad−2 for ethylene oxide and 1190 and 1130 ferg rad−2 for trimethylene oxide and are discussed in relation to the barriers to reorientation of the guest molecule. The bands due to these vibrations are fairly sharp at 4.3 K, but are broad and poorly defined at 100 K. The guest and water vibrations interact predominantly through their transition dipoles, although the main contribution to the force constants of the rotational vibrations is from steric forces. The absorption by the water vibrations above 100 cm−1 is very similar for ethylene oxide and cyclopropane hydrates but significantly different for trimethylene oxide hydrate. Strong objections exist to the obvious interpretations of this difference which remains unexplained.

scholarly journals H-bonding behavior of ethylene oxide within the clathrate hydrates revisited: Experiment and theory

2020 ◽  
Vol 754 ◽  
pp. 137728
Author(s):  
Zafer Maşlakcı ◽  
J. Paul Devlin ◽  
Nevin Uras-Aytemiz
Keyword(s):  
Ethylene Oxide ◽  
Clathrate Hydrates

Thermodynamic stability of clathrate hydrates relative to their separate chemical components

2003 ◽  
Vol 81 (1-2) ◽  
pp. 175-182 ◽  
Author(s):  
M A White ◽  
D C MacLaren ◽  
R A Marriott ◽  
B -Z Zhan
Keyword(s):  
Melting Point ◽  
Ethylene Oxide ◽  
Small Molecules ◽  
Low Temperatures ◽  
Experimental Information ◽  
Clathrate Hydrate ◽  
Clathrate Hydrates ◽  
Chemical Components ◽  
Melting Points ◽  
Guest Species

The thermodynamic changes (ΔH, ΔS, and ΔG) for the association of several small molecules (tetrahydrofuran (THF), ethylene oxide (EO), acetone) with water to form corresponding clathrate hydrates are calculated as a function of temperature from experimental information. For THF clathrate hydrate and EO clathrate hydrate at low temperatures, the clathrate is enthalpically stabilized with respect to the components. This is also the likely case for acetone clathrate hydrate. In all the three cases, above the melting points of the guest species, the clathrate increases in enthalpic stability, but entropic factors favour the separated components. Similar changes for THF clathrate hydrate and EO clathrate hydrate occur at the melting point of ice, eventually favouring the liquid components over the clathrate. PACS No.: 65.40-b

The effect of methanol on the stability of clathrate hydrates

1981 ◽  
Vol 59 (17) ◽  
pp. 2587-2590 ◽  
Author(s):  
D. W. Davidson ◽  
S. R. Gough ◽  
J. A. Ripmeester ◽  
Haruo Nakayama
Keyword(s):  
Ethylene Oxide ◽  
Clathrate Hydrates ◽  
Nmr Studies ◽  
The Stability

From the effect of added methanol on the decomposition temperatures of the clathrate hydrates of ethylene oxide and tetrahydrofuran, it was recently reported that methanol can be readily enclathrated in hydrates of both structure I and II. Dielectric and nmr studies of these two hydrates prepared in the presence of methanol do not support this conclusion. It is shown thermodynamically that the original measurements may be interpreted without the need for incorporation of methanol in the hydrates formed.

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