Bond distances ethane

Practice working with your Learning By Modeling software Construct molecular models of ethane ethylene and acetylene and compare them with respect to their geometry bond angles and C—H and C—C bond distances... 

FIGURE 2 7 Structures of methane ethane and propane showing bond distances and bond angles... 

In keeping with the bent bond de scription of Figure 3 10 the carbon-carbon bond distance in cycio propane (151 pm) is slightly shorter than that of ethane (153 pm) and cyclohexane (154 pm) The calculated val ues from molecular models (see Learning By Modeling) reproduce these experimen tal values... 

At 146 pm the C 2—C 3 distance m 1 3 butadiene is relatively short for a carbon-carbon single bond This is most reasonably seen as a hybridization effect In ethane both carbons are sp hybridized and are separated by a distance of 153 pm The carbon-carbon single bond m propene unites sp and sp hybridized carbons and is shorter than that of ethane Both C 2 and C 3 are sp hybridized m 1 3 butadiene and a decrease m bond distance between them reflects the tendency of carbon to attract electrons more strongly as its s character increases... 

Bond Distances, Bond Angles, and Bond Energies in Ethane, Ethene, and Ethyne (Table 9 1, p 342) Stmctures of a-Ammo Acids (Table 27 1, pp 1054-1055)... 

Structure. Ethylene is a planar molecule with a carbon—carbon bond distance of 0.134 nm, which is shorter than the C—C bond length of 0.153 nm found in ethane. The C—H bond distance is 0.110 nm, and the bond angles are [Pg.432]

Carbon-Carbon Bond Distances. The Electron Diffraction Investigation of Ethane, Propane, Isobutane, Neopentane, Cyclopropane, Cyclopentane, Cyclohexane, Allene, Ethylene, Isobutene, Tetramethylethylene, Mesitylene, and Hexamethylbenzene. 

Fig. 7.6 The torsional dependence of the central C-C bond distances in some substituted ethanes. All curves are graphs of relative values taken from L. Schafer, J. D. Ewbank, V. J. Klimkowski, K. Siam, and C. van Alsenoy, J. Mol. Struct. 135 (1986) 141, and L. Schafer, M. Cao, M. Ramek, B. J. Teppen, S. Q. Newton, and K. Siam, J. Mol. Struct, in press.

Note that the vicinal och—°ch stabilization is significantly stronger than that in ethane (Table 3.23), due to the significantly shorter C-C double-bond distance. 

Accordingly, 10 new reference bond energies must be dehned. This is done with respect to the well-known bonds of ethane. In addition, seven additional parameters are to be evaluated by means of our standard formulas, Eqs. (10.41) and (11.16), with proper consideration of a- and rr-electron populations. All these transformations, including those dictated by changes of internuclear distances, are straightforward but require attention. 

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