SYNTHESIS AND CHARACTERIZATION OF SOME NEW MONO- AND DIAMIDE COMPLEXES OF PLUTONIUM(IV) AND DIOXOURANIUM(VI) NITRATES

摘要

Plutonium tetranitrato complexes with N,N'-dialkyl monoamides A [A = dibutyl derivatives of hexanamide (DBHA), octanamide (DBOA)] and tetraalkyl diamides B [B = tetrabutyl, tetraisobutyl and tetrahexyl malonamide (TBMA, TIBMA, THMA)] have been isolated and characterized as Pu(NO3)(4) . 3A and Pu(NO)(3))(4) . 2B, respectively. Complexes with diamides such as Pu(NO3)(4) . 2TBMA and Pu(NO3)(4) . 2TIBMA were isolated as solids while all others were viscous liquids. Uranyl dinitrato-amide complexes with the above monoamides and diamides were synthesized and characterized as UO2(NO3)(2) . 2A and UO2(NO3)(2) . B. The IR and visible absorption spectra of the plutonium and uranium complexes indicate that they are O-bonded and the nitrate group acts as a bidentate group. The NMR spectra of the uranyl monoamide complexes indicate the existence of restricted rotation around the C-N bond, while thermal investigations reveal that decomposition proceeds through three exothermic steps corresponding to the release of amide and nitrate groups and finally leading to U3O8. [References: 24]