10025-93-1Relevant articles and documents
Catalytic Activity of UIII towards Hydrogenation of Olefins
Folcher, G.,Marechal, J. F. Le,Marquet-Ellis, H.
, p. 323 - 324 (1982)
It has been shown that UCl3 in tetrahydrofuran can catalyse the hydrogenation of olefins by LiH or LiAlH4 according to a mechanism involving two hydrogen atoms of the hydride.
FACILE SYNTHESIS OF UCl4 AND ThCl4, METALLOTHERMIC REDUCTIONS OF UCl4 WITH ALKALI METALS AND CRYSTAL STRUCTURE REFINEMENTS OF UCl3, UCl4 AND Cs2UCl6.
Schleid,Meyer,Morss
, p. 69 - 77 (1987)
Uranium and thorium tetrachloride (UCl//4 and ThCl//4) were obtained via the ammonium chloride route from UH//3 and thorium metal respectively, with the ternary chlorides (NH//4)//2ICl//6 and (NH//4)//2ThCl//6 acting as intermediates. The crystal structur
Cyclohexadienyl uranium complexes
Baudry, Denise,Bulot, Emmanuelle,Ephritikhine, Michel
, p. 169 - 175 (1990)
The potassium salt of the 6,6-dimethylcyclohexadienyl anion, (dmch)K, reacted with U(BH4)4 (I) to give (dmch)2U(BH4)2 (II), whereas (dmch)U(BH4)3 (III) was obtained from an equimolecular mixture of II and I.The anionic compounds K(18-crown-6)
VOLTAMMETRY OF URANIUM AND PLUTONIUM IN MOLTEN LiCl-NaCl-CaCl2-BaCl2 I. REDUCTION OF U(III) TO URANIUM METAL.
Poa,Tomczuk,Steunenberg
, p. 1161 - 1166 (1988)
The electrochemical reduction of U(III) to uranium metal in molten LiCl-NaCl-CaCl//2-BaCl//2 electrolyte was investigated, using cyclic voltammetry. The reaction is reversible and controlled by diffusion mass transfer, both at low-carbon steel and molybde
Standard enthalpies of formation of uranium compounds. VIII. UCl3, UCl5, and UCl6
Cordfunke, E. H. P.,Ouweltjes, W.,Prins, G.
, p. 495 - 502 (1982)
Enthalpies of solution of UCl3 in H2SO4(aq) have been measured calorimetrically.In the same way enthalpies of solution of UCl5 and UCl6 have been measured in (HCl + FeCl3)(aq) and HCl(aq), respectively.Together with data for the auxiliary reactions, the s
Thermochemical studies of the gaseous uranium chlorides
Lau, K. H.,Hildenbrand, D. L.
, p. 1312 - 1317 (1984)
The gaseous uranium halides UCl, UCl2, UCl3, UCl4, and UCl5 were generated under equilibrium conditions using several types of effusive beam sources, and were identified and characterized thermochemically by mass spectrometry.Five independent gaseous equi
Preparation and characterization of potassium, rubidium and ammonium tetrachlorouranate (III) trihydrates
Karbowiak,Drozdzynski
, p. 291 - 294 (1993)
The synthesis and characterization of a new series of hydrated uranium(III) complex chlorides of the general formula MIUCl4·3H2O (MI ≡ K, Rb or NH4) are reported. The compounds crystallize in the monoclinic system. Unit cell parameters were determined from X-ray powder diffraction data. The magnetic susceptibilities of the complex chlorides were measured by the Faraday method in the 4.2-300 K range. The compounds exhibit Curie-Weiss paramagnetism in the 100-300 K range, with the derived effective magnetic moments ranging from 3.57μB to 3.71μB. Solid state electronic and IR spectra were recorded in the 4000-30 000 and 80-4000 cm-1 ranges, respectively and discussed. Non-static high vacuum thermal dehydrations enabled us to obtain the anhydrous compounds KUCl4, RbUCl4 and UCl3.
Electrochemical behavior and some thermodynamic properties of UCl 4 and UCl3 dissolved in a LiCl-KCl eutectic melt
Kuznetsov,Hayashi,Minato,Gaune-Escard
, p. C203-C212 (2005)
The electrochemical behavior of UCl4, and UCl3 in LiCl-KCl eutectic melt was studied at 723-823 K by different electrochemical methods. Electroreduction of U(IV) in LiCl-KCl melt occurs via two successive steps involving transfer of one and three electrons. The diffusion coefficients of U(IV) and U(III) were determined by linear sweep voltammetry, chronopotentiometry, and chronoamperometry. The values found by these methods are in a good agreement with each other. The standard rate constants for the redox reaction U(IV) + e- → U(III) were calculated from cyclic voltammetry data and for the discharge process U(III) + 3e- → U by using the impedance spectroscopy method. The values of constants testify that the redox process proceeds quasireversibly, mostly under diffusion control, while electrodeposition is mainly controlled by the rate of charge transfer. The formal standard potentials of EU(IV)/U(III)*, E U(IV)/U*, and EU(III)/U* were determined by different electrochemical methods and some thermodynamic properties of UCl 4 and UCl3 dissolved in a LiCl-KCl eutectic melt were calculated. The influence of oxide ions on the electrochemical behavior of the LiCl-KCl-UCl4 melt was studied.
Dibenzouranocene and related compounds
Streitwieser Jr., Andrew,Kluttz, Robert Q.,Smith, Kennith A.,Luke, Wayne D.
, p. 1873 - 1877 (2008/10/08)
Bis(benzo[8-annulene])uranium(IV) (dibenzouranocene), 4, and the thorium analogue 5 have been prepared from benzocyclooctatetraene dianion and the metal tetrachlorides. The Diels-Alder product from cyclooctatrienyne and butadiene, 7,10-dihydrobenzocyclooctatetraene, 2, gave a uranocene derivative, 6, which could not be dehydrogenated to 4. Catalytic hydrogenation, however, did gave the uranium derivative 7 of tetrahydrobenzocyclooctatetraene. The corresponding deuterogenation gave 70% exo and 30% endo incorporation of deuterium. Reaction of cyclooctatetraene dianion with 1,4-dibromobutane gave cis-bicyclo[6.A.0]dodeca-2,4,6-triene, 8, which on deprotonation with KNH2/NH3 and treatment with UCl4 also gave 7. Analysis of NMR spectra of 4 indicates a spin density distribution closely related to that in the radical anion of benzocyclooctatetraene. The ligand exchange equilibrium between 4 and uranocene has been determined and found to favor the mixed-sandwich compound.
