)(H2O)(3))AL-2(2)-(NB6O19)(5)]CENTER-DOT-40.5H(2)O

Authors
Citation
H. Naruke et T. Yamase, )(H2O)(3))AL-2(2)-(NB6O19)(5)]CENTER-DOT-40.5H(2)O, Acta crystallographica. Section C, Crystal structure communications, 52, 1996, pp. 2655-2660
Citations number
11
Categorie Soggetti
Crystallography
ISSN journal
01082701
Volume
52
Year of publication
1996
Part
11
Pages
2655 - 2660
Database
ISI
SICI code
0108-2701(1996)52:<2655:)>2.0.ZU;2-9
Abstract
The [{Er3O(OH)(3)(H2O)(3)}Al-2(2)(Nb6O19)(5)](26-) anion in the title compound, octadecahydrogen octasodium dialuminopentanonacontaoxobis at rihydroxooxotrierbio)triacontaniobate(26-)-water (1/40.5), is composed of a central [{Er3O(OH)(3)(H2O)(3)}(2)](8+) cluster surrounded by thr ee equatorial [Nb6O19](8-) anions and two axial Al3+ cations within [A l(Nb6O19)](5-) moieties with approximate D-3 symmetry. A comparison of the geometry of this anion with that of the anion in the isomorphous Eu complex reveals that the smaller ionic radius of the Er atom induce s a contraction of the central {[Ln(3)O(OH)(3)(H2O)(3)](2)}(8+) cluste r (Ln = Er, Eu) with a resultant attraction of the equatorial and axia l [Nb6O19](8-) anions toward the centre of the complex by 0.09 and 0.0 7 Angstrom, respectively.