摘要:
                                Uranyl beta-diketone complex UO2(tfa)(2)center dot H2O (3) (tfa = deprotonated 4,4,4,-trifluoro-1-(2-furyl)-1,3-butanedione) has been successfully prepared by reacting UO2(OAc)(2)center dot 2H(2)O (OAc = O2CMe) with two equivalents of 4.4,4,-trifluoro-1-(2-furyl)-1,3-butanedione (H-tja: 1) in ethanol. Complex 3 was characterized by elemental analysis and FT-IR. Dissolving 3 in ethanol gave during several days single crystals of [UO2 (tfa)(2)(OHCH2CH3)] (4), wherein one ethanol molecule replaces aqua ligand. The solid-state structure of 4 was determined by a single X-ray analysis. Crystal data of C18H14F6O9U: a = 13.7163(7), b = 20.7528(10), c = 7.4664(4) angstrom, beta = 90.818(4)degrees, space group P2(1)/c, Z = 4 and d(calc) = 2.270 mg/m(3). Complex 4 adopted a distorted pentagonal bipyramidal geometry. The coordinated oxygen atoms of tja (deprotonated-1) ligands are occupying equatorial positions, while the oxygen atoms of UO22+ are still in the axial positions. The formation of the pi-pi interactions together with hydrogen bonded result in the set up a 3D-supramolecular architecture. The electronic absorption of 3 is reported and discussed. (C) 2011 Elsevier B.V. All rights reserved.