COMPLEXES BETWEEN URANYL-NITRATE AND BENZO-15-CROWN-5 - STRUCTURES OF THE (2/1) AND (1/1) COMPLEXES OF BENZO-15-CROWN-5 DIAQUADINITRATODIOXOURANIUM(VI)

(1) [UO2(NO3)2(H2O)2].2C14H20O5, M(r) = 966.69, monoclinic, P2(1)/n, a = 10.891 (3), b = 8.312 (2), c = 20.507 (6) angstrom, beta = 97.21 (2)-degrees, V = 1842 (1) angstrom3, Z = 2, D(x) = 1.74 g cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 42.56 cm-1, F(000) = 956, T = 295 K, R = 0.024 for 1994 unique reflections. (2) [UO2(NO3)2(H2O)2].C14H20O5, M(r) = 698.38, triclinic, P1BAR, a = 8.477 (2), b = 8.809 (2), c = 16.700 (3) angstrom, alpha = 105.18 (2), beta = 82.42 (2), gamma = 110.08 (2)-degrees, V = 1129 (1) angstrom3, Z = 2, D(x) = 2.05 g cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 68.86 cm-1, F(000) = 668, T = 295 K, R = 0.033 for 2431 unique reflections. In both complexes, the crown ether molecules are hydrogen bonded to the two water molecules of the hexagonal bipyramidal [UO2(NO3)2(H2O)2]. In complex (1), two crown ether molecules are linked to one U complex to form a molecular structure whereas in complex (2), each crown ether molecule is shared by two U complexes to form polymer chains.