Structure
GdCl3 is monoclinic with a hexagonal UCl3 structure, as seen for other 4f trichlorides including those of La, Ce, Pr, Nd, Pm, Sm, Eu (in contrast GdCl3 crystallizes in the PuBr3 motif and the following crystallize in theYCl3 motif: DyCl3, HoCl3, ErCl3, TmCl3, YdCl3, LuCl3, YCl3). The UCl3 motif features 9-coordinate metal with a tricapped trigonal prismatic coordination sphere. In the hexahydrate of gadolinium(III) chloride and other smaller 4f trichlorides and tribromides, six H2O molecules and 2 Cl- ions coordinate to the cations resulting in a coordination group of 8.
Read more about this topic: Gadolinium(III) Chloride
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