
%0 Journal Article
%A Semenova, Lioubov I. 
%A Sobolev, Alexander N. 
%A Skelton, Brian W. 
%A White, Allan H. 
%T Structural Systematics of Rare Earth Complexes. XV Tris(2,2&#8242;:6&#8242;,2&Prime;-terpyridine)lanthanoid(<emph type="6">III</emph>) Tris(perchlorate) Complexes
%J Australian Journal of Chemistry
%D 1999/08/05
%V 52
%N 6
%P 519-530
%K 
%R https://doi.org/10.1071/CH98046
%U https://www.publish.csiro.au/paper/CH98046 
%X Room-temperature single-crystal X-ray structure determinations of the 1 : 3 adducts of the trivalent lanthanoid perchlorates with 2,2&#8242;:6&#8242;,2&Prime;-terpyridine (&#8216;tpy&#8217;) as crystallized from acetonitrile are recorded. The Ln = La complex is the only one of its structural type, being modelled as La(ClO4)3/tpy/MeCN/H2O (1 : 3 : 2 :2/3), trigonal P 3c1, Z = 6, a 13&#183;063(7), c 53&#183;04(4) &#197;, recorded on an interim basis, with conventional R on &#124;F&#124; 0&#183;081 for No 2889 &#8216;observed&#8217; (I &#62;3&#963;(I)) reflections. For Ln = Ce, (Pr, Sm,) Eu and, by presumption, other intermediate members, a monosolvate is found, monoclinic P 21/n, a &#x2248; 9&#183;3, b &#x2248; 21&#183;1, c &#x2248; 24&#183;7 &#197;, &#946; &#x2248; 91&#176;, Z = 4, R being 0&#183;045, (0&#183;060, 0&#183;049,) 0&#183;047 for No 4420, (4199, 3931,) 3713. The Ln = Eu adduct has also been obtained unsolvated in a form representative of Ln = Eu, Lu and, by presumption, intermediate members, as well as Y, which is monoclinic C 2/c, Z = 4, R being 0&#183;051, 0&#183;044, 0&#183;061 for No 4386, 4407, 3713. All monoclinic systems are of the form &#91;Ln(tpy)3&#93; (ClO4)3(.S), Ln being nine-coordinate, and in the case of the C 2/c phase lying on a crystallographic 2 axis. The Ln = La adduct was modelled with three independent cations, all with crystallographic 3 symmetry, two with their coordination number augmented by the approach of solvent along the 3 axis. 
