Ethane molecular structure

As discussed in Sec. 4, the icomplex function of temperature, pressure, and equilibrium vapor- and hquid-phase compositions. However, for mixtures of compounds of similar molecular structure and size, the K value depends mainly on temperature and pressure. For example, several major graphical ilight-hydrocarbon systems. The easiest to use are the DePriester charts [Chem. Eng. Prog. Symp. Ser 7, 49, 1 (1953)], which cover 12 hydrocarbons (methane, ethylene, ethane, propylene, propane, isobutane, isobutylene, /i-butane, isopentane, /1-pentane, /i-hexane, and /i-heptane). These charts are a simplification of the Kellogg charts [Liquid-Vapor Equilibiia in Mixtures of Light Hydrocarbons, MWK Equilibnum Con.stants, Polyco Data, (1950)] and include additional experimental data. The Kellogg charts, and hence the DePriester charts, are based primarily on the Benedict-Webb-Rubin equation of state [Chem. Eng. Prog., 47,419 (1951) 47, 449 (1951)], which can represent both the liquid and the vapor phases and can predict K values quite accurately when the equation constants are available for the components in question. 

The potential function that governs internal rotation in ethane is represented in Fig. 6. The three equivalent minima correspond to equilibrium positions, that is, three identical molecular structures. The form of this potential function for an internal rotator with three-fold symmetry can be expressed as a Fourier series,... 

Working first with Polanyi, Weissenberg, and Brill, and later as the leader of the Textile Chemistry Section, Mark successively published papers on the crystal structures of hexamethylenetetramine, pentaerythritol, zinc salts, tin, urea, tin salts, triphenylmethane, bismuth, graphite, sulfur, oxalic acid, acetaldehyde, ammonia, ethane, diborane, carbon dioxide, and some aluminum silicates. Each paper showed his and the laboratory s increasing sophistication in the technique of X-ray diffraction. Their work over the period broadened to include contributions to the theories of atomic and molecular structure and X-ray scattering theory. A number of his papers were particularly notable including his work with Polanyi on the structure of white tin ( 3, 4 ), E. Wigner on the structure of rhombic sulfur (5), and E. Pohland on the low temperature crystal structure of ammonia and carbon dioxide (6, 7). The Mark-Szilard effect, a classical component of X-ray physics, was a result of his collaboration with Leo Szilard (8). And his work with E. A. Hauser (9, 10, 11) on rubber and J. R. 

Compounds with molecular structures similar to those of the repeating units are called model compounds, and much information about the properties of polymecs may be derived from knowledge of these model compounds. Thus, a person who knows the chemical properties of ethane can fairly well extrapolate this to the chemistry of hdpe. Of course, the physical and thermal properties of hdpe are much different from those of ethane. 

The resulting adduct has the same number of valence electrons as the ethane molecule, C2H6, and has the same structure with the two parts of the molecule having rotational freedom around the N— B coordinate bond, or covalent C-C bond in ethane. Coordinate or dative bonds are usually drawn in molecular structures as arrows to represent the direction of the donation process as in donor atom—>acceptor atom... 

Compound 3a was found to react with excess water to produce a mixture of organic products including butane, ethene and ethane.17 However, when trace amounts of water were introduced into a hexane solution of 3b, the oxo complex 12 is formed. The molecular structure of 12 shows that it is formed by reaction of 2 equivalents of 3b and 1 equivalent of water ... 

Zeng et al. have examined the coordination of ZnPc with three bipyridines, namely l,2-bis(4-pyridyl)ethane(61), Irans-1,2-bis(4-pyridyl)cthcnc (62), and 1,3-bis(4-pyridyl)propane (63) [63], The former two bipyridines are linear molecules favoring the formation of H-shaped supramolecular complexes ZnPc 61 ZnPc and ZnPc 62 ZnPc, while the last bipyridine adopts a V-shaped conformation leading to the formation of a T-shaped 1 1 complex (ZnPc 63). The molecular structures of all these complexes have been determined by X-ray diffraction analyses. The... 

Carlton, T.S. (1998). Correlation of Boiling Points with Molecular Structure for Chlorofluoro-ethanes. J.Chem.Inf.Comput.ScL, 38,158-164. 

The crystal structures of glycylaminomethylphosphonic acid, and of methane-, ethane-, and propane-diphosphonic acids, have been determined. The unit cell of the last acid contains two molecules, with different conformations. The molecular structures of the constrained phosphite (161), the phosphate (162), and the thio-phosphate (163) have been compared. The nitrogen in the last compound is very nearly trigonal planar, and the large P—N distance (313 pm) shows that there is little P - - N interaction. The phosphazene (164) adopts a novel conformation, ... 

The method of molecular orbitals has been applied to the problem of diborane by Mullikan9 who considered both the ethane-like structure and the bridge structure XI which is really identical with the protonated double... 

From the results reported in the literature using low dielectric constant solvents such as dioxane (15), tetrahydrofuran and dimethoxy-ethane (16), or benzene (13, 14), the chemical makeup of the solvent, its molecular structure, or both, might well influence the final results. With the first three solvents the presence of oxygen atoms seems to be... 

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