Journal ArticleDOI
Polyhedral Clathrate Hydrates. IX. Structure of Ethylene Oxide Hydrate
R. K. McMullan,G. A. Jeffrey +1 more
TLDR
In this paper, a detailed single-crystal structure analysis was performed for ethylene oxide hydrate and the results confirmed the polyhedral host lattice formed by 46 hydrogen-bonded water molecules in a cubic unit cell of 12.03 A with space-group symmetry Pm3n.Abstract:
A detailed single‐crystal structure analysis is reported for ethylene oxide hydrate. This confirms the polyhedral host lattice formed by 46 hydrogen‐bonded water molecules in a cubic unit cell of 12.03 A with space‐group symmetry Pm3n. Disordered ethylene oxide molecules occupy the six equivalent tetrakaidecahedral cavities, and their electron‐density distribution suggests that they are hindered axial rotors. Additional guest molecules, either ethylene oxide, oxygen, or nitrogen molecules occupy the two dodecahedral cavities with high disorder and low statistical weight. The compound is therefore nonstoichiometric having the limiting formula 2M·6C2H4O·46H2O, in which the percentage of M is variable. If M is assumed to be entirely ethylene oxide, as is likely from the method of preparation, the composition of the crystals obtained from an equilibrated aqueous solution of 8 mole % ethylene oxide at 9°C is 6.4C2H4O·46H2O.read more
Citations
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A new clathrate hydrate structure
TL;DR: In this article, a new hexagonal hydrate structure requiring both large and small guest molecules to stabilize the structure is reported, which is expected to be isostructural with the hexagonal clathrasil dodecasil-lH.
Journal ArticleDOI
Towards a fundamental understanding of natural gas hydrates
TL;DR: The present article focuses on the application of a range of physico-chemical techniques and approaches for gaining a fundamental understanding of natural gas hydrate formation, decomposition and inhibition.
Journal ArticleDOI
Exploitation of the hydrogen bond: recent developments in the context of crystal engineering
TL;DR: A review of recent developments in the field with particular emphasis on how symmetry and function at the molecular level can be used to control solid-state architecture is provided in this paper, where hydrogen bonding represents perhaps the best understood non-covalent force.
Journal ArticleDOI
Clathrate Hydrates: From Laboratory Science to Engineering Practice
TL;DR: In this article, the authors highlight the recent hydrate literature focusing on the thermodynamics, kinetics, structural properties, particle properties, rheological properties, and molecular mechanisms of formation.
References
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Journal ArticleDOI
Polyhedral Clathrate Hydrates. X. Structure of the Double Hydrate of Tetrahydrofuran and Hydrogen Sulfide
Thomas C. W. Mak,R. K. McMullan +1 more
TL;DR: The structure of the tetrahydrofuran/hydrogen sulfide double hydrate has been determined from three-dimensional single-crystal data as discussed by the authors, and the analysis confirmed the clathrate host lattice characteristic of 17 cubic (Type II) gas hydrates.
Journal ArticleDOI
The Crystal Structure of Melamine
TL;DR: In this paper, the crystal structure of dicyandiamide, the dimer of cyanamide, was investigated, with the results described in Section 2.2.1.
Journal ArticleDOI
The Structure of Chlorine Hydrate
Linus Pauling,Richard E. Marsh +1 more
TL;DR: The determination of the structure of ice and the development of an understanding of the nature of the hydrogen bond have strongly suggested that these substances are clathrate compounds, with a tetrahedral hydrogen-bonded framework of water molecules defining cavities large enough to contain the other molecules.
Journal ArticleDOI
Polyhedral Clathrate Hydrates. V. Structure of the Tetra‐n‐butyl Ammonium Fluoride Hydrate
TL;DR: The (n−C4H9)4N+C6H5−COO−·39.8 H2O is tetragonal, of space group P42/m with the unitcell dimensions a=23.52 A and c=12.30 A as mentioned in this paper.