Thorium hydride

Hartmann, I. et al., Rept. Invest. No. 4835, Washington, US Bur. Mines, 1951 Thorium hydride explodes on heating in air [1], and the powdered hydride readily ignites on handling in air [2], Layers of thorium or uranium hydrides ignited spontaneously after exposure to ambient air for a few min [3],... [Pg.1689]

Layers of uranium or thorium hydrides ignited spontaneously after exposure to ambient air for a few min [1], Thermal decomposition yields pyrophoric uranium [2],... [Pg.1689]

Although not the central subject of this review, several thorium dihaptocarbamoyl complexes ( 4) Th(n2-CONR2)/ were also examined with respect to thorium hydride-catalyzed reduction. Under 0.75 atm H2 and over the course of several days at temperatures as high as 100°C, no hydrogenation was observed. These results are in accord with other spectral, structural, and chemical data (14) indicating the importance of carbamoyl resonance hybrids O and P, and that the carbene-like reactivity is significantly reduced in comparison to the acyls (14) ... [Pg.75]

Thorium dioxide, 24 761-762 Thorium fluorides, 24 762 Thorium halides, 24 762-763 Thorium hydrides, 24 761 Thorium hydroxide, 24 756 Thorium iodides, 24 763 Thorium isotopes, 24 753-754... [Pg.947]

Magnesium hydride, 4463 Magnesium-nickel hydride, 4464 Plutonium(III) hydride, 4509 Poly (germanium dihydride), 4415 Poly (germanium monohydride), 4413 Potassium hydride, 4427 Rubidium hydride, 4450 Sodium hydride, 4444 f Stibine, 4510 Thorium dihydride, 4489 Thorium hydride, 4540 Titanium dihydride, 4490 Titanium-zirconium hydride, 4491 Trigermane, 4421 Uranium(III) hydride, 4511 Uranium(TV) hydride, 4541... [Pg.240]

Aluminum thorium hydride, neutron diffraction studies on, 8 238-239... [Pg.8]

The orgarometallic chemistry of actinides. ignored in the early development of the field, is currently receiving a great deal of attention.1 7 In many instances the chemistry of this group of elements is unlike that of the transition metals. For example, it has been shown that a thorium hydride, in contrast to the manganese hydride shown above, does undergo CO insertion.138... [Pg.885]

Marks has reported (108) the reversible carbonylation of thorium hydrides (r)-C5Me5)2Th(H)(OR) [R = f-C4H9, 2,6-(f-C4H9)2CeH3] to... [Pg.34]

Thorium hydride (ThH2), when deposited in thin layers, will ignite at room temp within a few minutes after exposure (Ref 4, p 32)... [Pg.718]

TI1H4 (c). Dissociation pressure data on thorium hydride were reported by Chauvenet4 and Matignon and Delepine.1... [Pg.328]

Magnesium—nickel hydride, 4458 Plutonium(III) hydride, 4504 Poly(germanium dihydride), 4409 Poly(germanium monohydride), 4407 Potassium hydride, 4421 Rubidium hydride, 4444 Sodium hydride, 4438 f Stibine, 4505 Thorium dihydride, 4483 Thorium hydride, 4535 Titanium dihydride, 4484 Titanium—zirconium hydride, 4485 Trigermane, 4415 Uranium(III) hydride, 4506 Uranium(IV) hydride, 4536 Zinc hydride, 4486 Zirconium hydride , 4487 See COMPLEX HYDRIDES, PYROPHORIC MATERIALS See entry LANTHANIDE—TRANSITION METAL ALLOY HYDRIDES... [Pg.2433]

A trimeric thorium hydride Th3H6(0 — 2, 6-/-Bu2C6H3)6, which represents a rare example of an early-metal hydrido complex supported exclusively by aryloxide ligation, was synthesized according to reaction (5.69), and its structure is shown in 985 [352] ... [Pg.456]

HisTh4 (s) Th4Hi5 (s) Thorium Hydride HisTh4 (s) Th4Hi5 (s)... [Pg.584]

In a rather formal way the hydrides of thorium and uranium fall within the scope of this review. The thorium hydrides have been known for many years. They are obtained by the direct reaction of the metal with hydrogen. [Pg.101]

The thorium hydrides are thermally more stable than uranium hydride, and thus the dissociation pressure of hydrogen over ThH2 is 9228.4 Pa at 1000 K. [Pg.101]

Diffusion in thorium hydride has also been explored using an emanation measurement technique (313). [Pg.102]

A further study of the decomposition kinetics of thorium hydride has been made (314). [Pg.102]

The decomposition of thorium hydride is controlled by kinetic rather than diffusion parameters [14]. The value of is 58 kJ mol for the decomposition of TI1H3 between 483 and 663 K and is 137 kJ mol" for the decomposition of ThH, 5 in the interval 873 to 1073 K. Reaction orders were reported to be 0.34 and 0.25, respectively. The evolution of hydrogen from PbH j proceeds [15] at about 463 K in steps during an increasing temperature programme and the apparent magnitude of , increases from 6.7 to 15 kJ moT as the hydrogen content decreases. [Pg.315]

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