Compounds of Uranium

P. A. G. O Hare, "Thermochemistry of Uranium Compounds XV. Calorimetric Measurements on UCI4, UOiCl . and UCFF . and the Standard Molar Enthalpy of Formation at 298.15 K of UC14", J. Chem. Thermodyn.. 17. 611-622 (1985). 

At 0.06 millimole of uranium compound per 100 g of butadiene, conversions of more than 90 % were obtained after a reaction time of three hours. The rate of polymerization is of the first order in relation to both the monomer (Figure 1) and the catalyst concentration. The polymers have a cis content of about 98 to 99 % and a broad molecular weight distribution. 

Plutonium. The compound formation pattern of this metal shows several analogies with that of uranium. Compound formation is systematically observed with the elements from the 7th group on and, with a few intermediate phases, in the systems with some elements of the very first groups. 

Dieke, G. H., Duncan, A. B. F. Spectroscopic properties of uranium compounds. New York McGraw-Hill 1949. 

Voegtlin C, Hodge HC Pharmacology and Toxicology of Uranium Compounds, Vol 1, pp 413M-14. New York, McGraw-Hill, 1949... 

Cox has commented instead on the 417/2 main line binding energies in UO2, showing that the ehemical shifts from their position in a-U in a series of uranium compounds of increasing ionic character indicate a charge transfer which is much less than that expected in an ionic picture. This implies of course a strong p-f covalency. 

Herbert Newby McCoy, 1870-1945. American chemist who made outstanding contributions to radioactivity and the chemistry of the lare earths In 1904 he showed that indium is produced by spontaneous transmutation of uranium Three years later, m collaboration with W. H. Ross, he pointed out the identical chemical behavior of the compounds of certain elements which F Soddy later called isotopes. Dr McCoy also gave the first quantitative proof that the o-ray activity of uranium compounds is directly proportional to their uranium content (78). 

The closed-shell system thorium(IV) shows no electron transfer satellites (15). Protactinium is too rare and too radioactive to be measured by us, but certain uranyl compounds such as RbUC>2(02N0)3 show satellites about 3.5 eV above /(IJ4/5/2) and 7(U4/7/2) probably due to electron transfer to the empty 5/ shell. The somewhat peculiar photo-electron spectra of uranium compounds are further discussed Chapter IIF. 

Voegtlin, C., Hodge, H.C. (1949a). Pharmacology and Toxicology of Uranium Compounds Part 1. McGraw-Hill, New York, NY. 

The pulmonary toxicity of uranium compounds varies in animals. Reports of pulmonary toxicity in animals after acute-duration exposure to uranium are limited to experiments with uranium hexafluoride. Gasping and severe irritation to the nasal passages were reported after 10 minute exposures at 637 mg U/mg in rats and mice (Spiegl 1949) and nasal hemorrhage in rats after a 5 minute exposure to 54,503 mg/m (Leach et al. 1984). Uranium hexafluoride promptly hydrolyzes on contact with water to uranyl fluoride and hydrofluoric acid. Thus, the animals were potentially exposed to hydrofluoric acid, a potent toxicant to respiratory tract epithelium, which probably contributed to pulmonary tissue destruction (Leach et al. 1984 Spiegl 1949 Stokinger et al. 1953). In addition, exposure to fluoride ions can result in hypocalcemia, hypomagnesemia, pulmonary edema, metabolic acidosis, ventricular arrhythmia, and death (Meditext 1998). 

Evidence also suggests that the toxicity of uranium varies according to the route of exposure and to its compounds. This finding may be partly attributable to the relatively low gastrointestinal absorption of uranium compounds. Only <0.1-6% of even the more soluble uranium compounds are absorbed in the gastrointestinal tract. On the basis of the toxicity of different uranium salts in animals, it was concluded that the relatively more water-soluble salts (uranyl nitrate hexahydrate, uranyl fluoride, uranium pentachloride) were primarily renal and systemic toxicants. The less water-soluble compounds (uranium trioxide, sodium diuranate, ammonium diuranate) were of moderate-to-low toxicity, while the insoluble compounds (uranium tetrafluoride, uranium dioxide, uranium peroxide, triuranium octaoxide) were... 

Dermal Effects. No significant dermal effects were observed in animals given inhalation or oral doses of uranium compounds (Spiegl 1949 Stokinger et al. 1953). However, dermal application of uranium... 

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