
TY  - JOUR
A1  - Lim, Kevin C. 
A1  - Skelton, Brian W. 
A1  - White, Allan H. 
T1  - Structural Systematics of Rare Earth Complexes. XXII. ('Maximally') Hydrated Rare Earth Iodides
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2001
VL  - 53
IS  - 10
SP  - 867
EP  - 873
KW  - Rare earths; crystal structures.
UR  - https://doi.org/10.1071/CH00119 
N2  - Low-temperature (c. 153 K) single-crystal X-ray structure determinations, carried out on trivalent rare earth iodides crystallized from aqueous solution at room temperature, have defined two series of hydrates, LnI3.nH2O. For Ln = La&#8211;Ho, a nonahydrate phase (n = 9) is defined, orthorhombic Pmmn, a ~ 11.5, b ~ 8.0, c ~ 8.8 &#197;, Z = 2, the second phase (n = 10), monoclinic P21/c, Z = 4 being defined for Ln = Er&#8211;Lu, a ~ 8.2, b ~ 12.8, c ~ 17.1 &#197;, &#946; ~ 103.7&#x02DA;. Neither of these phases is isomorphous with any of those pertinent to the previously studied chloride or bromide (hydrated) arrays, nor, unlike those, does the halide (iodide) in any case enter the coordination sphere of the lanthanoid. The n = 9 phase takes the form &#91;Ln(OH2)9&#93;I3, the nine-coordinate lanthanoid environment stereochemistry being tricapped trigonal-prismatic, while the n = 10 phase is &#91;Ln(OH2)8&#93;I3.2H2O, the eight-coordinate lanthanoid environment being square-antiprismatic. 
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