Abstract
The i.r. and Raman spectra of N, N-dimethylurea (CH 3) 2NCONH 2 and its three deuterated analogues (CH 3) 2NCOND 2, (CD 3) 2NCONH 2 and (CD 3) 2NCOND 2 in the crystalline state were recorded in the 4000-100 cm −1 region. The observed spectra were analyzed on the basis of spectral comparison with structurally related compounds and of normal coordinate calculations, and vibrational assignments were made for the four species of dimethylurea. The molecule is suggested to be in a centrosymmetric dimer, different from a ribbon polymer of urea and some urea derivatives.
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