[en] Complexes of composition Th(N03)4.3L (L = MeCONHEt [ea]), M(N03)4.2.5L (M = Th, L = MeCON(Prsup(i))2 (dipa) and M = U, L = ea and dipa), Pu(N03)4.2L (L = ea and dipa) and U02N03.2L(L = dipa) have been prepared. Their IR, Raman (thorium compounds only) and electronic spectra are reported. (author)