Synthèse et étude cristallographique d'un nouveau composé de coordination asymétrique de l'uranium(IV) lié à deux ligands du type polytungstate [(H3SbIIIW17O59)UIV(HW5O18)]11-

The heteropolytungstate [(H3SbIIIW17O59)UIV(HW5O18)]11- was prepared using sodium tungstate and uranium(IV) fluoride or chloride. The crystallographic study shows a uranium(IV) atom at the centre of a square antiprism. It is bound by four oxygen atoms to a H3SbIIIW17O59 ligand and by four other oxygen atoms to a HW5O18 ligand. The unit cell is centered triclinic: a =13.4229(10), b =19.1285(12), c =19.3562(11), α =92.227(5), β =98.722(6), γ =96.378(6), V =4874(1) Å3. To cite this article: Y. Jeannin, C. R. Chimie 8 (2005).