Plumbane

Lead hydrogen

Gaseous

-13 ° C

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Plumban, also lead, hydrogen is a very poisonous gas. It has the formula pBH4 and has a boiling point of -13 ° C.

Production and representation

Plumban formed by the action of atomic hydrogen on finely divided lead. It is also formed when Dimethylplumban disproportionates with the formula ( CH3) 2PbH2 above -50 ° C. In the preparation of tetraethyl Plumban formed in small quantities as a byproduct.

Properties

In contrast to analog based methane ( CH4) is Plumban chemically unstable. When passing the gas over a heated surface, it decomposes to deposit a lead level. The reason is that lead is a metal more electropositive than the bonded hydrogen atoms, that is, the hydrogen bonds as a hydride.

More stable than the Plumban are derivatives with organic substituents, for example,

• Tetramethyl lead Pb ( CH3) 4 or
• Tetraethyl lead, Pb ( C2H5 ) 4 ( TEL).

These materials were used before the development of lead-free gasoline as an antiknock agent. Since they are hautresorbierbar and toxic ( TLV TEL 0.075 mg/m3), one has leaded gasoline, banned in Germany since 1998 since 2000 in the European Union.