Abstract
The reactions between bis(pyridine-2,6-dicarboxylato)-uranium(IV), U(dip)/sub 2/ and N-heterocyclic bases (L) in methanol (L = pyridine, 2-methylpyridine, 3-methylpyridine and 4-methylpyridine) produce eight coordinate uranium(IV) complexes, U(dip)/sub 2/(H/sub 2/O)L which have been characterized by elemental analysis, ir studies, thermal analysis and magnetic susceptibility measurement. The anionic complex (Ph/sub 4/As)/sub 2/(U(dip)/sub 3/), 3H/sub 2/O has been isolated by reacting U(dip)/sub 2/ with pyridine-2,6-dicarboxylic acid in the presence of tetraphenyl arsonium chloride. Uranium(IV) complexes of the type U(quind)/sub 2/(acetate)/sub 2/, U(quin)(acetate)/sub 2/ (quindH = quinaldinic acid, quinH/sub 2/ = quinolinic acid, acetate = CH/sub 3/COO/sup -/) have also been prepared by the interaction of the methanolic solution of uranium tetraacetate and the respective acids.
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