The Infra-Red Spectrum of Borine Carbonyl and a Normal Coordinate Analysis of Axial WXYZ3 Molecules

The infra-red spectrum of borine carbonyl has been investigated in the region 2 to 25μ. Two perpendicular-type bands have been partially resolved, and indicate that the molecule is a symmetric top with symmetry C3v. A normal coordinate analysis of axial WXYZ3 molecules has been carried out and applied to H3BCO, the following values having been obtained for the force constants: kCO=17.3, kBC=2.97, kBH=3.21, kBCO=0.142, kHBC=0.333, kHBH=0.363, all in units of 105 dynes/cm.