Abstract
The potentially trinucleating ligands H4L were synthesized in situ by reacting 2,6-dipicolinoyl-hydrazine with 4-acyl-1-phenyl-3-methyl-pyrazolones-5 (acyl = benzoyl, acetyl, iso-butyryl or iso-valeroyl) in a 1∶2 molar ratio. These ligands react with an excess of uranyl acetate dihydrate to yield trinucleating uranyl complexes [(UO2)3(L)(DMF)4(OAc)2] · (H2O)5. Tentative structures for the complexes have been proposed on the basis of elemental analyses, i.r. and electronic data. The force constant (f) for the vas(O=U=O) vibration and values for the U-O distance, RU-O, are calculated. The spectral studies support the trinuclear structure.
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