VIBRATIONAL SPECTRUM AND STRUCTURE OF CYANAMIDE

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1962

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Ohio State University

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The infrared and Raman spectra of $NH_{2}CN$ and $ND_{2}CN$ have been examined in the liquid state. Polarization data imply a planar configuration and seven fundamentals can be assigned as the planar vibrations of a molecule having $C_{2v}$ symmetry. For wavelengths longer than $15\mu$, however, the spectra are too rich to be consistent with the planar configuration. The low frequency bands are best interpreted on the basis of a non-planar equilibrium configuration with a small barrier to inversion about the amino-nitrogen $atom.^{1}$ This small departure from planarity produces such a small effect on the ''planar'' fundamentals that the polarization data are indistinguishable from those expected from a truly planar molecule.

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$^{1}$ D. J. Millen, G. Topping, and D. R. Lide, Jr., J. Mol, Spectroscopy, 8, 153 (1962)
Author Institution: Department of Chemistry, The University of Tennessee

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