Vibrational spectrum and structure of dimethylamino-dichloroarsine

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The infrared spectra of solid and gaseous dimethylaminodichloroarsine have been recorded from 4000 to 33 cm −1. The Raman spectra of the liquid and solid phases have also been recorded. A comparison of the Raman spectra of the liquid and solid indicates that there is a change in conformational composition between the two phases. The isomer present at room temperature in the liquid and gas phases is assigned to the trans form. A study of the temperature dependence of the intensities of the Raman spectrum indicates that the trans form is converted to a second isomer which is believed to be the gauche isomer as the temperature is decreased. At −190°C, the Raman intensities indicate that the molecule still exists as a mixture of these two isomers. A vibrational assignment is presented and discussed in detail.