
TY  - JOUR
A1  - Kepert, Cameron J. 
A1  - Junk, Peter C. 
A1  - Skelton, Brian W. 
A1  - White, Allan H. 
T1  - Structural Systematics of Rare Earth Complexes. XX (Maximally) Hydrated Rare Earth Sulfates and the Double Sulfates (NH<emph tye="8">4</emph>)Ln(SO<emph tye="8">4</emph>)<emph tye="8">2</emph>.4H<emph tye="8">2</emph>O (Ln = La, Tb)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1999
VL  - 52
IS  - 6
SP  - 601
EP  - 616
KW  - 
UR  - https://doi.org/10.1071/CH98050 
N2  - Room-temperature single-crystal X-ray studies carried out on trivalent rare earth sulfate hydrates, Ln2(SO4)3.xH2O, crystallized at local ambience suggest the following arrays to be prevalent. For Ln = La, the nonahydrate is found, hexagonal P 63/m, with conventional R on &#124;F&#124; 0&#183;023 for No 1159 &#8216;observed&#8217; (I &#62;3&#963;(I)) diffractometer reflections (redetermination). Although for Ln = Ce a similar structure has been previously recorded, we have obtained that adduct as the monoclinic C 2/c, Z = 4, octahydrate, a phase also found for Ln = Lu and diverse representative intermediate lanthanoids: a &#x2248; 13&#183;6, b &#x2248; 6&#183;6, c &#x2248; 18&#183;2 &#197;, &#946; &#x2248; 102&#176;; for Ln = Ce (redetermination), Dy, Yb (redetermination), Lu, R was 0&#183;022, 0&#183;035, 0&#183;031, 0&#183;024 for No 3279, 2127, 3008, 3325 respectively. The structures of two lower hydrates adventitiously obtained are also recorded: the pentahydrate for Ln = Ce, monoclinic C 2/c, a 15&#183;741(3), b 9&#183;632(3), c 10&#183;358(3) &#197;, &#946; 119&#183;72(2)&#176;, Z = 4, R 0&#183;030 for No 3372 (a redetermination), and the trihydrate for Ln = Lu, orthorhombic Cmc21, a 13&#183;527(5), b 18&#183;415(5), c 9&#183;242(7) &#197;, Z = 8, R 0&#183;040 for No 1743. All structures are infinite polymeric arrays, the lanthanoid atoms being bridged by sulfate ions. Studies are also recorded for the ammonium/trivalent rare earth double sulfate tetrahydrate salts, (NH4)Ln(SO4)2.4H2O, for the (hitherto) extremal members Ln = La, Tb, which are isomorphous with the previously studied Ln = Sm monoclinic P 21/c, Z = 4 array, a &#x2248; 6&#183;6, b &#x2248; 19, c &#x2248; 8&#183;8 &#197;, &#946; 97&#176;; R 0&#183;035, 0&#183;037 for No 3631, 3337. The array is a two-dimensional polymer, parallel to the ac plane. 
ER  -

