
%0 Journal Article
%A Semenova, Lioubov I. 
%A Junk, Peter C. 
%A Skelton, Brian W. 
%A White, Allan H. 
%T Structural Systematics of Rare Earth Complexes. XVI (&#8216;Maximally&#8217;) Hydrated Rare Earth(<emph type="6">III</emph>) Bromides
%J Australian Journal of Chemistry
%D 1999/08/05
%V 52
%N 6
%P 531-538
%K 
%R https://doi.org/10.1071/CH98047
%U https://www.publish.csiro.au/paper/CH98047 
%X Room-temperature single-crystal X-ray structure determinations carried out on rare earth bromides crystallized from water at room temperature define three series of hydrates LnBr3.nH2O. For Ln = La, Ce, a heptahydrate phase (n = 7) is defined, triclinic P 1, a &#x2248; 8&#183;6, b &#x2248; 9&#183;4, c &#x2248; 8&#183;3 &#197;, &#945; &#x2248; 108, &#946; &#x2248; 99, &#947; &#x2248; 72&#176;, isomorphous with the array described for the &#8216;early&#8217; (Ln = La-Pr) rare earth chlorides, being binuclear &#91;(H2O)7Ln(-Br)2Ln(OH2)7&#93; Br4, Z = 1 dimer; conventional R on &#124;F&#124; were 0&#183;051, 0&#183;042 for 2323, 3451 independent &#8216;observed&#8217; (I &#62; 3&#963;(I)) diffractometer reflections respectively. For Ln = Pr(-)Dy, a hexahydrate phase is defined, monoclinic P 2/n, a &#x2248; 10&#183;0, b &#x2248; 6&#183;8, c &#x2248; 8&#183;2 &#197;, &#946; &#x2248; 93&#183;5&#176;, Z = 2 f.u., isomorphous with the array defined for the heavier (Ln = Nd, Lu, Y) rare earth chlorides, being &#91;(H2O)6LnBr2&#93; Br, with R 0&#183;029, 0&#183;034 for No 1590, 1388 respectively. For Ln = Ho(-)Lu, Y, an octahydrate is defined for the first time, monoclinic P 21/n, a &#x2248; 8&#183;1, b &#x2248; 16&#183;0, c &#x2248; 10&#183;1 &#197;, b &#x2248; 94&#183;0&#176;, Z = 4 f.u., a new array of the form &#91;Ln(OH2)8&#93; Br3 emerging, with R 0&#183;061, 0&#183;048, 0&#183;042 for No 1191, 2402, 1674 respectively, the metal environment being square antiprismatic. 
