Abstract
Spectra of acetanilide have been observed with the electric vector in turn along each of the three crystal axes over a wide frequency range for CH
3
CONHC
6
H
5
, for CH
3
CONDC
6
H
5
and for a material which approximated to CD
3
CONHC
6
H
5
. In addition, some observations have been made on crystals in which a very small proportion of the NH groups were replaced by ND. It has been found that the transition moment of the 1666 cm
–1
(carbonyl) band is accurately in the plane of the amide group and makes an angle between 20 and 24° to the C═O bond, being inclined towards the direction of the CN bond. Transition moment directions for a number of other bands have been determined, though in some cases ambiguity arises because of the crystal symmetry. The effects of deuteration both of NH and of CH
3
groups are complicated and indicate that many bands arise from modes which are not localized in small groups within the molecule. Few of the bands disappear on melting, and it does not appear that the complications, except perhaps in the NH stretching modes, arise mainly from lattice effects.
Reference13 articles.
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