
%0 Journal Article
%A Harrowfield, JM 
%A Lu, WM 
%A Skelton, BW 
%A White, AH 
%T Structural Systematics of Rare Earth Complexes. II. Structural Characterization of Lanthanoid(III) Picrate Hydrates: the Triclinic P1, 11.5 Hydrates of the Later Rare Earths and Yttrium
%J Australian Journal of Chemistry
%D 1994/02/01
%V 47
%N 2
%P 339-348
%K 
%R https://doi.org/10.1071/CH9940339
%U https://www.publish.csiro.au/paper/CH9940339 
%X Picrates of dysprosium(III), holmium(III), erbium(III), thulium(III), ytterbium(III), lutetium(III) and yttrium(III) have been found to crystallize as needles from aqueous solution, seemingly best described as 11.5 hydrates. Single-crystal X-ray structure determinations have been performed at c. 295 K on the Dy , Er , Lu and Y species, and show them to be isomorphous , triclinic, P&#299; , a 20.043(7) &#8594; 20.019(5), b 11.533(2) &#8594; 11.471(2), c 8.1567(7) &#8594; 8.1538(8) &#506;, &#945; 88.60(1) &#8594; 88.40(1), &#946; 87.12(2) &#8594; 87.06(1), &#947; 75.07(2) &#8594; 75.05(2)&#176;, V 1819 &#8594; 1807 &#506;3 ( Dy &#8594; Lu; the Y and Er values are intermediate). Complex ions [ Ln ( pic )(OH2)7]2+ are observed, with a pair of uncoordinated picrate anions and 4.5 lattice water molecules; this result is in contrast to that of the monoclinic, P 21/c, series found for La &#8594; Pr and Nd &#8594; Tb, in which the complex cation contains two picrate anions. 
