Abstract
The infrared absorption spectrum of trimethylamine-iodine complex was measured in the wavelength region of 2.5 to 200 μ. In the far infrared region two strong absorption peaks, which were characteristic of the complex and reasonably assigned to the stretching vibrations of the II and N⋯I bonds, were observed at 185 and 145 cm −1. The normal vibrations of the complex were calculated by regarding the system as a linearly oriented three bodies. The calculated result was in good agreement with the observed one. The assumed force constant of II bond (0.952 md/Å), which was remarkably smaller than the value for the free molecule (1.76 md/Å), was found to be quantitatively explained by Badger's rule. The spectrum of the complex was compared with that of gaseous trimethylamine.
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