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The Planarity of the Urea Molecule

Waldron, Robert D. and Badger, Richard M. (1950) The Planarity of the Urea Molecule. Journal of Chemical Physics, 18 (4). p. 566. ISSN 0021-9606.

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Arguments based on infra-red observations were recently presented by W. E. Keller for the planarity of the urea molecule in the crystalline state. Though plausible, we have not found these completely convincing since the statement that in a nonplanar model one of the A_1 hydrogen bending fundamentals should be essentially inactive is based on certain assumptions, and not on a selection rule required by symmetry. The really conclusive evidence is to be found in the 3µ region where the resolving power of the spectrometer employed by Keller seems to have been inadequate. In the planar model four N-H valence frequencies may be active, two of which have the character A_1. In the nonplanar C_(2v) model only three of these fundamentals can be active, and only one of these has the character A_1.

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Additional Information:© 1950 American Institute of Physics. Received 10 February 1950. The investigation here described was supported in part by the Bureau of Ordnance under Contract N6-ori-102, VI with the ONR.
Funding AgencyGrant Number
Office of Naval Research (ONR)N6-ori-102, VI
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Caltech Gates and Crellin Laboratories1391
Issue or Number:4
Record Number:CaltechAUTHORS:20140807-165557542
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Official Citation:The Planarity of the Urea Molecule Waldron, Robert D. and Badger, Richard M., The Journal of Chemical Physics, 18, 566-566 (1950), DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48218
Deposited By: George Porter
Deposited On:08 Aug 2014 14:34
Last Modified:03 Oct 2019 07:01

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