Uranium, hydride formation

The uranium hydride formation rate in ICP-MS, which is relevant for Pu and... 

A direct determination of plutonium isotopes in soils and sediments was proposed by Boulyga et al. (2004) by Laser Ablation (LA)-ICP-MS. To minimize uranium hydride formation and peak tailing of on mass/charge = 239, LA-ICP-MS measurements were carried... 

Experimental and Theoretical Evidence for the Formation of Several Uranium Hydride Molecules. 

Gueron, J., and L. Yaffe Formation of Uranium Hydride. Nature 160, 575... 

The hydride compounds HAn[N(SiMe3)2]3 (An = Th, U) are the sole products of attempts to introduce an additional equivalent of the bis(trimethylsilyl)amide ligand. Reaction of the uranium hydride complex with the Lewis acid B(C6F5)3 results in loss of H2 and formation of the zwitterionic product U+[N(SiMe3)2]2[N(SiMe3)(SiMe2CH2B (C6F5)3]. ... 

Likewise, CO2 reacts with (Cp )3UH (where Cp = T) -C5H4SiMe3) [226] to afford the formate derivative (Cp )3UOCHO, which further reacted with the starting uranium hydride to give the dioxymethylene complex (Cp )3U0CH20U(Cp )3 ... 

Equilibrium Constants for Formation of Point Defects in Uranium Hydride... 

As the above results indicate, the photochemistry of these uranium-alkyl complexes is not fully resolved. The olefin formation during Marks s siudy of UCP3R in toluene solution suggests that photoinduced /3-hydride elimination occurs to some extent, presumably via a mechanism similar to that of Scheme 1. However, the other data appear to indicate a predominant radical mechanism via photoinduced M—R bond homolysis. 

It has recently been reported83 that di-n-cyclooctatetraene complexes of uranium, thorium, and plutonium can be prepared by the direct reaction of the finely divided metals with cyclooctatetraene. The finely divided metals were prepared by a procedure described by Seaborg and Katz.84 Several cycles of formation and descomposition of the hydride gave a finely divided reactive metal. However, treatment of the pyrophoric uranium with cyclopentadiene under the same conditions used to form uranocene failed to produce any detectable amounts of the known compounds U(CsH5)3 or U(C5H5)4. 

---