Infrared spectrum and configurations of methyl N-methylthiocarbamate

Normal vibration analysis of the in-plane vibrations of methyl N-methylthiocarbamate, CH3NH(CS)OCH3, has been carried out employing the Urey-Bradley-Shimanouchi force field; the band assignments and force constants have been compared with those of related molecules. Rotational isomerism about the C-N bond of alkylthiocarbamates has been examined by infrared and NMR spectroscopy. Perturbations of the infrared bands of CH3NH(CS)OCH3 in its complexes with iodine and metals have been briefly discussed.