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Researchers reported making uranium and thorium hydrides without charging reactions with hydrogen gas by using liquid phenylsilane as the hydride source. The one-pot reactions were carried out in solution at 50 °C; the reported motivation was easier handling and dosing, not a demonstrated universal safety advantage.
How the H₂-free route works
In the reported method, phenylsilane supplies hydride in place of molecular hydrogen (H₂). Rather than charging a reaction vessel with hydrogen gas, researchers add the liquid reagent to a solution containing the actinide starting materials. Chemistry World’s 2015 account describes the reactions as one-pot syntheses in solution at 50 °C.
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The reported targets were uranium and thorium hydrides. The coverage describes tests involving known compounds, but it does not provide a complete list of substrates or detailed experimental conditions. The exact procedures and scope should therefore be taken from the original paper, not inferred from the summary.
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The practical distinction is how the hydride source is introduced. Hydrogen-based preparations can involve elevated pressure and temperature and specialized infrastructure. Phenylsilane is a liquid that can be dispensed with a syringe, which the researchers described as more convenient for precise small-scale work. Jaqueline Kiplinger of Los Alamos National Laboratory explained, “Working with hydrogen isn’t always practical,” and noted that “Being precise on an NMR scale with hydrogen is tricky but phenylsilane is a liquid, so it’s much easier to be able to use a syringe and “dump” the hydride source into the reaction,” as quoted by Chemistry World.
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This is a handling rationale, not evidence that phenylsilane makes the chemistry inherently safe or removes the need for specialist controls. The same Chemistry World report notes that organoactinide compounds can be highly sensitive to air and moisture. Work with actinide hydrides remains specialist laboratory chemistry.
What the reported results establish—and what they do not
Chemistry World characterized yields in the one-pot demonstrations as high and said they sometimes exceeded those of the traditional route. It supplied no numerical yields or substrate-by-substrate results, so the comparison cannot be quantified from that account.
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The reported work establishes a demonstrated approach for uranium and thorium hydrides; it does not establish that the method works for every actinide, lanthanoid, or class of starting material. Kiplinger said, “We need to see if this system can translate into the lanthanoids or transuranic elements and if it can work on more than the metallocenes.” Steve Liddle, co-director of the Centre for Radiochemistry Research at the University of Manchester, called it “a valuable study” and said access to f-block hydrides “in a routine way is welcomed.”
The underlying publication is J. K. Pagano et al., “Phenylsilane as a safe, versatile alternative to hydrogen for the synthesis of actinide hydrides,” Chemical Communications (2015), DOI 10.1039/C5CC06856H. Its detailed experimental tables are needed to assess exact conditions, compounds, yields, and limitations. Liddle’s broader view was that the reagent could “give widespread access to previously unobtainable hydrides” and encourage new molecule families and synthetic approaches; that is a potential, not a result demonstrated across those wider classes.
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