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The far-infrared and Raman spectra of the tetra-alkylammonium salts of mixed tetrahalogeno-complexes of arsenic(III), antimony(III), and bismuth(III), [R4N][MX3Y]
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1970
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Raman SpectraCrystal StructureEngineeringChemistrySpectra-structure CorrelationSolid StateInorganic CompoundTetra-alkylammonium SaltsMaterials ScienceInorganic ChemistryPhysicsCrystallographyInorganic SynthesisNatural SciencesSpectroscopyCoordination ComplexMixed Tetrahalogeno-complexesCs SymmetryMain Group ChemistryAxial PositionMolecular Complex
The far-i.r. and Raman spectra are reported for tetra-alkylammonium salts of [MX3Y]– anions (X ≠ Y: M = As, X or Y = Cl or Br; M = Sb, X or Y = Cl, Br, or I; M = Bi, X or Y = Cl, Br, or I; excluding [BiBr3Cl]–). Except in the cases of [Et4N][SbBr3Cl] and [Bun4N][Sbl3Br] in the solid state, the spectra are indicative of structures of Cs symmetry based on trigonal bipyramidal arrangements of electron pairs around the group VB element. For M = Sb or Bi, and X = Cl, either Y or the lone pair of electrons occupies an axial position, whereas for all the other [MX3Y]– species both axial sites are occupied by X atoms.