| Abstract: | The far infrared spectra (750 to 50 cm⁻¹) of certain BF₃-amine complexes in the solid state were obtained. The vibrational assignments have been made for the low frequency modes of BF₃NH₂CH₃ and BF₃NH(CH₃)₂, both of which have C[subscript]s symmetry. They have been compared with the published assignments for BF₃NH₃ and BF₃N(CH₃)₃, both of which have C[subscript]3v symmetry. The effect of lowering the symmetry from C[subscript]3v to C[subscript]s has been discussed. The PMR spectra of these same complexes were obtained in appropriate solvents. In BF₃NH₂CH₃ and BF₃NH(CH₃)₂ the methyl proton spectra were found to be coupled to the proton on the nitrogen and to the boron nucleus. In BF₃--N(CH₃)₃, in addition to the boron nucleus, the methyl protons appeared to be coupled to the fluorine nuclei with a coupling constant of about 0.8 cps. Far infrared solid state studies were also made on a number of R₂CuCI₄ and R₂SbBr₅ complexes, each having a number of different cations. Frequencies are reported in the range 650 to 50 cm⁻¹. The region from 600 to 300 cm⁻¹ displayed bands associated with the organic cation, while the region from 300 to 50 cm⁻¹ displayed predominantly the bands of the anion. While the spectrum of the ... |
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