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is a cation and L a multidentate aminopolycarboxylate ligand were prepared as described by Moeller et aL8 Compounds were prepared with Nt-(2-hydroxyethyl)ethylenediamine-NNN'-triacetic acid (hedta) , ethylenediamine-NNN'N'-tetra-acetic acid (edta), 1,2-diaminocyclohexane-NNN'N'-tetra-acetic acid (dcta) , and diethylenetriamine-NNN'N'N"-penta-acetic acid (dtpa) as ligands, and H+, K+, NH,+, or Baa+ as cations. A number of preparative methods 9-11 for europium(II1) P-diketone complexes were attempted and found t o give uncharacterisable products. The methods described by Melby et ~1 . 1 ~ and Bauer et uZ.l3 were used as a basis for the preparation of EulI1 (4-diketone complexes. Complexes of the general formula, L[Eu-(P-diketone),] where L is a cation (Na+, K+, (C,H,),N+) were prepared by mixing together stoicheiometric amounts of europic chloride, the P-diketone, and a suitable base in an ethanolic mediuni.12 The preparation and isolation of solid tris-P-diketones proved more difficult and no general method was evolved. A series of EulI1 (1,lOphenanthroline) (P-diketone) compounds were prepared by the method of Bauer et u1.13 Other 1,lO-phenanthroline complexes of EulI1 were prepared as described by Hart et a1.14 and Sinha et uZ.15 ~6~17

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Mossbauer spectroscopy has been used to observe the production of an 'anomalous' charge state, U ~E U ~+ , following the electron capture decay of 151GdS+ incorporated in Erz(Cz04)3, 10H20.

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