Synthese et etude cristallographique d'un nouveau compose de coordination asymetrique de l'uranium(IV)lie a deux ligands du type polytungstate[(H3Sb~(III)W17O59)U~(IV)(HW5O18)]~(11-)

摘要

The heteropolytungstate[(H3Sb~(III)W17O59)U~(IV)(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 H3Sb~(III)W17O59 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),alpha=92.227(5),beta=98.722(6),gamma=96.378(6),V=4874(l)A3.