Abstract
Urey-Bradley force field (UBFF) and orbital valence force field (OVFF) techniques have been applied to the hexachloride and the hexabromide anions (O h symmetry) of tantalum(I) and niobium(I). Trends in stretching force constants have been discussed on the basis of (i) the periodic position of the central metal atom and (ii) the nature of the halide ligands. Comments have been made also on the suitability of the force fields used.
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Mehta, M.L., Avasthi, M.N. Normal coordinate analysis of tantalum(I) and niobium(I) hexahalide anions. Journal of Crystal and Molecular Structure 2, 299–302 (1972). https://doi.org/10.1007/BF01246647
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DOI: https://doi.org/10.1007/BF01246647