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The nature of bond orbitals and the origin of potential barriers to internal rotation in molecules

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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Abstract

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.


Item Type:Article
Additional Information:Copyright © 1958 by the National Academy of Sciences. Communicated December 16, 1957.
Record Number:CaltechAUTHORS:PAUpnas58a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PAUpnas58a
Alternative URL:http://www.pnas.org/cgi/content/abstract/44/2/211
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1217
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Jan 2006
Last Modified:14 Nov 2014 19:18

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