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Group Frequencies and Band Assignments

Approximate vibrational assignments have been given for [(R3N)2BH2] I (R = H or Me) using the group frequency approach. Bands due to the i/(BH2), 5(BH2), and i/(BN2) modes appeared to shift very little on going to the ionic system from R3N,BH2X. [Pg.91]

Figure 2.21 shows the seven normal modes of vibration of square-planar XY4 molecules. Vibrations V3, V6, and V7 are infrared-active, whereas Vi V2, and V4 are Raman-active. However, V5 is inactive both in infrared and Raman spectra. In the case of the [PdCl4] ion, the V5 was observed at 136 cm by inelastic neutron scattering (INS) spectroscopy [1088]. Table 2.6j lists the vibrational frequencies of some ions belonging to this group. Chen et al. [1088a] also reported the IR and Raman spectra of K2[MX4] (M = Pt or Pd and X = Cl or Br) and band assignments on the basis of normal coordinate analysis. [Pg.210]

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