Abstract
The i.r. spectra of methanesulfonamide and its C- and N-deuterated compounds in the crystalline state have been recorded. Vibrational assignments have been made on the basis of the i.r. dichroism and the isotope effects. Normal coordinate analyses for CH 3SO 2NH 2, CH 3SO 2ND 2, CD 3SO 2NH 2 and CD 3SO 2ND 2 have been carried out by using the C s , molecular model and a modified Urey—Bradley force field. The potential energy distribution indicates that the shift of the SN stretching frequency on the N-deuteration is attributed to the vibrational coupling between the SN stretching and the ND 2 bending vibration.
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