Infra-red spectra of sulphamide and sulphamide- d4

Abstract

The infra-red spectra of sulphamide and sulphamide- d 4 have been recorded for ordinary and polarized radiations. The vibrational assignment has been made by referring to the infra-red dichroism as well as to the isotopic effect. Normal co-ordinate analysis of sulphamide and sulphamide- d 4 as nine atomic molecules has been carried out by assuming the molecular symmetry of C 2ν. The calculation of potential energy distributions has shown that the shift of the NSN symmetric and antisymmetric stretching bands on N-deuteration is attributed to the vibrational coupling between the SN stretching and the ND 2 bending vibrations.