TiO2 (Rutile) has a
common structural arrangement
shared by many fluorides of the transition metals
with formula MX2, like MnF2. Generally,
if the radius ratio r-/r+ exceeds ~1.37 then a rutile rather than
fluorite structure is favoured.
Complexes that share this structure include..
CrF2, CrCl2, FeF2, CoF2, NiF2.
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