209807-24-9Relevant academic research and scientific papers
Synthetic, spectroscopic, and X-ray crystallographic studies on the uranyl(VI) complexes of the β-diketophenol ligands 1-(2-hydroxyphenyl)-1,3-butanedione and 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione
Ainscough, Eric W.,Brodie, Andrew M.,Cresswell, Roger J.,Waters, Joyce M.
, p. 37 - 45 (2008/10/08)
The preparation of the mononuclear complexes [UO2(HL1)2(MeOH)] and [UO2(HL2)2(EtOH)], the heterobinuclear complexes [UO2Mn(L1)2(EtOH)] 1.5H2O and [UO2Mn(L2)2(EtOH)] 2H2O, and the oxo-ligand adducts [UO2(HL1)2(Ph3AsO) ] 2H2O, [UO2(HL2)2(Ph3PO)] and [UO2(HL2)2(Ph3AsO)] (H2L1 = 1-(2-hydroxyphenyl)-3-butanedione and H2L2 = 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione) is described. The complexes have been characterized by a variety of physicochemical techniques and the crystal structures of [UO2(HL1)2(EtOH)] and [UO2(HL2)2(EtOH)] EtOH determined. Crystals of the former are triclinic, space group P1, a = 8.076(1), b = 8.131 (1), c = 10.161 (1) A, α = 108.49(1), β = 112.26(1), γ = 89.89(1)° and Z = 1. The latter is also triclinic, space group P1, a = 12.184(3), b = 15.578(5), c = 9.035(2) A, α = 91.05(2), β = 103.20(2), γ = 73.21(2)° and Z = 2. Both complexes contain seven-coordinate uranium (VI) in a pentagonal bipyramidal geometry in which the two bidentate β-diketonato ligands and the coordinated ethanol make up the equatorial pentagonal plane. For the complex [UO2(HL1)2(EtOH)] the HL1 ligands are in a trans arrangement with respect to one another, whereas for the [UO2(HL2)2(EtOH)] EtOH complex the HL2 ligands adopt a cis arrangement. However, in solution variable temperature 1H NMR spectra indicate that the cis and trans isomers are in equilibrium for both complexes.
