Pauling, Linus (1958) The nature of bond orbitals and the origin of potential barriers to internal rotation in molecules. Proceedings of the National Academy of Sciences of the United States of America, 44 (2). pp. 211-216. ISSN 0027-8424 http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas58a
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Twenty years ago Kemp and Pitzer(1) discovered that the relative rotation of the two methyl groups about the carbon-carbon bond in ethane is not completely free but is restricted by a potential barrier about 3.0 kcal/mole high, with three maxima and three minima in a complete rotation, corresponding to the trigonal symmetry of the methyl groups. It was soon found that rotation about single bonds is restricted in many molecules, and many experimental values for the height of the potential barrier have been obtained by the analysis of thermodynamic quantities (entropy, heat capacity) and especially by the methods of microwave spectroscopy.
|Additional Information:||Copyright © 1958 by the National Academy of Sciences. Communicated December 16, 1957.|
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|Deposited By:||Tony Diaz|
|Deposited On:||05 Jan 2006|
|Last Modified:||26 Dec 2012 08:43|
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