Syntheses, Crystal Structures, and Nonlinear Optical Activity of CsBa[AnO(CHCOO)] (An = U, Np, Pu) and Unprecedented Octanuclear Complex Units in KR(HO)[UO(CHCOO)] (R = Sr, Ba).

X-ray diffraction was applied to the elucidation of crystal structures of single crystals of CsBa[AnO(CHCOO)], where An = U(I), Np(II), Pu(III), and KR(HO)[UO(CHCOO)], where R = Sr(IV), Ba (polymorphs V-a and V-b). FTIR spectra were analyzed for the uranium-containing crystals I, IV, and V-b. Isostructural cubic crystals I-III are constructed of typical mononuclear anionic complex units [AnO(CHCOO)] and charge-balancing Cs and Ba cations.

Synthesis and X-ray Crystallography of [Mg(H2O)6][AnO2(C2H5COO)3]2 (An = U, Np, or Pu).

Synthesis and X-ray crystallography of single crystals of [Mg(H2O)6][AnO2(C2H5COO)3]2, where An = U (I), Np (II), or Pu (III), are reported. Compounds I-III are isostructural and crystallize in the trigonal crystal system. The structures of I-III are built of hydrated magnesium cations [Mg(H2O)6](2+) and mononuclear [AnO2(C2H5COO)3](-) complexes, which belong to the AB(01)3 crystallochemical group of uranyl complexes (A = AnO2(2+), B(01) = C2H5COO(-)).