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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 45,
  • Issue 9,
  • pp. 1491-1496
  • (1991)

Infrared Study of Tetraalkylureas in Dilute Solutions

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Abstract

The νC=O frequency for tetraalkylureas (TAU) shifts to lower frequency, progressing in the series tetramethyl, tetraethyl, and tetrabutyl, and the strength of the intermolecular hydrogen bond between a CHCl<sub>3</sub> proton and the C=O group increases, progressing in a series in the same order. The νC=O frequency decreases in the order hexane, carbon tetrachloride, and chloroform. The data indicate that TAU molecules exist in equilibrium with one, two, and three hydrogen-bonded complexes of CHCl<sub>3</sub> and CCl<sub>4</sub>. These complexes, together with bulk dielectric effects of the solvent, account for the continual decrease in frequency as the mole % CCl<sub>4</sub>/C<sub>6</sub>H<sub>14</sub>, CHCl<sub>3</sub>/C<sub>6</sub>H<sub>14</sub>, or CHCl<sub>3</sub>/CCl<sub>4</sub> increases.

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