The formation of adducts between Np (TTA)~ and neutral donors ToPe, TPPO, DBBP, Dose and TBP in benzene medium has been studied by spectrephotometry and. the presence of 1 : 1 adducts is shown. From the spectral changes observed, the adduct formation constants wore evaluated and found to be 1.85 x 104 (TPPO), 4-72 • 10 ~ (DBBP) and 2"12 • 10 a (DOSe). The spectra indicated that adduct formation increases the coordination number of Np(IV)from 8 in Np(TTA)4 to 9 in the adduets formed. Data obtained using the solvent extraction method to evaluate the adduct formation constant of Np(TTA)4 with TPPO are also included.
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