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

Ethylene oxide hydrate non-stoichiometry: measurements and implications

2002 ◽  
Vol 57 (5) ◽  
pp. 705-713 ◽  
Author(s):  
Zhongxin Huo ◽  
Marc D. Jager ◽  
Kelly T. Miller ◽  
E.Dendy Sloan
Keyword(s):  
Ethylene Oxide ◽  
Oxide Hydrate

The Infrared Spectrum of Ethylene Oxide Clathrate Hydrate between 360 and 20 cm−1, at 100 °K

1972 ◽  
Vol 50 (21) ◽  
pp. 3443-3449 ◽  
Author(s):  
J. E. Bertie ◽  
D. A. Othen
Keyword(s):  
Hydrogen Bonds ◽  
Infrared Spectrum ◽  
Ethylene Oxide ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Empirical Correlation ◽  
Strong Absorption ◽  
Water Molecules ◽  
Oxide Hydrate ◽  
Infrared Frequencies

The infrared spectra of authenticated samples of ethylene oxide hydrate and deuterate at 100 °K have been measured between 360 and 20 cm−1. The spectra confirm that the water molecules are orientationally-disordered and reorient slowly compared to far-infrared frequencies. An empirical correlation is suggested between the frequencies of strong absorption and the number of non-equivalent hydrogen bonds, their length and distribution. The contribution to the spectrum by the ethylene oxide intermolecular vibrations is discussed.

Aqueous nonelectrolyte solutions. Part XIII. Ice and hydrate freezing points of aqueous ethylene oxide solutions and the formula of congruent ethylene oxide hydrate

1995 ◽  
Vol 73 (6) ◽  
pp. 788-796 ◽  
Author(s):  
David N. Glew ◽  
Norman S. Rath
Keyword(s):  
Ethylene Oxide ◽  
Standard Error ◽  
Hydrate Formation ◽  
Standard Errors ◽  
Single Measurement ◽  
Method Of Least Squares ◽  
Oxide Hydrate ◽  
Dynamic Cooling ◽  
Freezing Temperatures ◽  
Freezing Curve

Ice freezing temperatures and hydrate formation temperatures have been measured by the dynamic cooling method for aqueous ethylene oxide (EO) solutions containing from 0 to 95 mol% EO. The ice and the congruent hydrate freezing temperatures exhibited standard errors on a single measurement of 0.004 °C and 0.013 °C, respectively. The ice–hydrate eutectic temperature was observed at −2.107 °C with standard error 0.001 °C and composition 1.991 mol% EO with standard error 0.008 mol% EO. The congruent hydrate was found to freeze at 11.083 °C with standard error 0.002 °C and composition 12.64 mol% EO with standard error 0.02 mol% EO. The formula of the congruent hydrate was EO•6.91H2O with standard error 0.013 mol water/mol EO. Only a single hydrate was found over the whole composition range down to −26 °C: the shoulder of the hydrate freezing curve above 40 mol% EO resulted from the high activity coefficients to dilute water in concentrated EO solutions. Equations and best values for the ice freezing temperatures and the hydrate formation temperatures together with their standard errors were evaluated by the method of least squares. Keywords: clathrate hydrate of ethylene oxide, freezing of water – ethylene oxide, ethylene oxide hydrate.

Kinetics of formation of ethylene oxide hydrate. Part II. Incongruent solutions and discussion

1968 ◽  
Vol 46 (24) ◽  
pp. 3867-3877 ◽  
Author(s):  
D. N. Glew ◽  
M. L. Haggett
Keyword(s):  
Heat Conduction ◽  
Ethylene Oxide ◽  
Oxide Hydrate ◽  
Early Stages ◽  
Kinetics Of Formation ◽  
Kinetics Of

Equations were developed to describe the experimental rates of formation of ethylene oxide hydrate from stirred, incongruent solutions. Heat conduction through the walls of the dilatometer bulb was rate-controlling. Results for congruent solutions were consistent with these equations during the early stages of hydrate growth.

The Far Infrared Spectra and X-Ray Powder Diffraction Patterns of the Structure I Hydrates of Cyclopropane and Ethylene Oxide at 100 °K

1975 ◽  
Vol 53 (1) ◽  
pp. 71-75 ◽  
Author(s):  
John E. Bertie ◽  
Frances E. Bates ◽  
David K. Hendricksen
Keyword(s):  
Infrared Spectrum ◽  
Ethylene Oxide ◽  
Diffraction Pattern ◽  
Powder Diffraction ◽  
Low Frequency ◽  
Far Infrared ◽  
Lattice Parameter ◽  
X Ray ◽  
Oxide Hydrate ◽  
Diffraction Patterns

This paper presents the far-infrared spectrum and X-ray powder diffraction pattern of the structure I hydrate of cyclopropane at 100 °K, and the powder diffraction pattern of the isostructural ethylene oxide hydrate at 100 °K. Between 360 and 100 cm−1 the absorption by cyclopropane hydrate is essentially identical to that by ethylene oxide hydrate, but is shifted to low frequency by about 2%. This shift is undoubtedly related to the hydrogen bonds being slightly longer in cyclopropane hydrate, whose cubic lattice parameter is 11.98 ± 0.02 Å compared to 11.89 ± 0.02 Å for ethylene oxide hydrate, both at 110 ± 20 °K. The absorption by cyclopropane hydrate below 100 cm−1 decreases rapidly with decreasing frequency; this confirms that the absorption plateau observed for ethylene oxide hydrate between 100 and about 50 cm−1 is due to primarily rotational vibrations of ethylene oxide. A recent statement, that the orientational disorder of the water molecules need not be invoked to explain the far infrared spectrum of ice 1 h, is disputed.

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
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