Lanthanide oxyhalide
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Through Lanthanide and Oxide
- LnX3 + H2O → LnOX + 2 HX (X = Cl, Br, I)
The lanthanide oxyfluorides are the unique member of the series. They are prepared by the thermal reaction of the trifluorides and the oxides:
- Ln2O3 + LnF3 → 3LnOF
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Structures
The lanthanide oxychlorides, oxybromides, and oxyiodides adopt layered structures featuring 8-or 9-coordinated Ln ions sandwiched between arrays of halide and oxides. Most of the lighter oxychlorides follow the PbFCl motif, but the three heaviest adopt structures like that of SmSI (samarium sulfide iodide).
The oxyfluorides adopt the fluorite structure.