Phosphine oxide complexes of thorium(IV), uranium(IV), neptunium(IV), and dioxouranium(VI) nitrates

Abstract

Complexes of the actinoid tetranitrates with phosphine oxides, M(NO₃)₄,xR₃PO (R = Me(tmpo), M = Th, U, X = 4 and M = Th, Np, x= 3; R = Prⁿ(tprpo), M = Th, U, Np, x= 2·67; R = Buⁿ(tbpo) M = Th, x= 4; R = Me₂N(hmpa), M = Th, U, Np, x= 2; R = Ph(tppo), M = Np, x= 2) and with the bidentate phosphine oxides, octamethylpyrophosphoramide(ompa), Th(NO₃)₄,2·5ompa and M(NO₃)₄,1·5ompa (M = Th, U, Np), bis(diphenylphosphinyl) methane (ppm), Th(NO₃)₄ 1·5ppm and bis(diphenylphosphinyl)ethane, Th(NO₃)₄2ppe, have been prepared, along with the uranium(VI) analogues UO₂(NO₃)₂,xL (L = tprpo, x= 2; L = ppm, x= 1·5). The i.r., Raman, and electronic spectra of these complexes are discussed.