Abstract
The covalency of elongated octahedral fluoride complexes of d9 ions (Ni+ and Cu2+) has been derived from magnetic resonance data. From these values and those corresponding to the Ni+-F- distance (derived from the experimental isotropic superhyperfine constant) it is reasonably concluded that the ultraviolet band recently observed for Ni+ in CaF2, SrF2 and BaF2 arises from a 3d to 4p transition of free Ni+. This is the first time that a 3d to 4p transition of a 3d cation has been found to lie in the near-ultraviolet region.
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