Newman, Roger and Badger, Richard M. (1951) The Infrared Spectra of N-Acetylglycine and Diketopiperazine in Polarized Radiation at 25° and at –185°C. Journal of Chemical Physics, 19 (9). pp. 1147-1153. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:NEWjcp51b
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The infrared absorption spectra of single crystals of N-acetylglycine and of diketopiperazine have been observed at room temperature, and at –185°C, using polarized radiation. The spectrum of the former substance shows some remarkable changes with temperature. In both cases cooling produces a pronounced narrowing of the broad bands due to the vibration of hydrogen atoms involved in strong hydrogen bonds. The two spectra furnish examples of NH absorption in the two extremes of weak and very strong hydrogen bonding. In diketopiperazine two possible interpretations of the doublet structure in the NH valence band are offered.
|Additional Information:||Copyright © 1951 American Institute of Physics. Received April 17, 1951. We should like to express our thanks to Dr. R.B. Corey for several helpful discussions and to Dr. J.A. Berson (University of Southern California) who prepared some of the diketopiperazine used in this work. This investigation was supported by the ONR under contract N6-ori-102, VI. Gates and Crellin Laboratories of Chemistry, Contribution No. 1558. Erratum: Infrared Spectra of n-Acetylglycine and Diketopiperazine in Polarized Radiation at 25° and at –185°C. Roger Newman et al. J. Chem. Phys. 20, 527 (1952).|
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