Abstract
Co-ordination complexes of the diphosphazane dioxides Ph2P(O)N(Pri)P(O)Ph2 L1, Ph2P(O)N(Pri)P(O)Ph(OC6H4Me-4) L2 and Ph2P(O)N(Pri)P(O)(O2C12H8) L3 with UO22+ or Th4+ ions have been synthesised and characterised by IR and NMR spectroscopy. The structures of [UO2(NO3)2L1] and [Th(NO3)2L13][Th(NO3)6] are established by X-ray crystallography. In the former, the uranyl ion is bonded to two bidentate nitrate groups and the two phosphoryl groups of the ligand L1; the co-ordination polyhedron around the metal is a hexagonal bipyramid. The cationic moiety in the thorium complex contains three bidentate diphosphazane dioxide ligands and two bidentate nitrate groups around the ten-co-ordinated metal.
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