Diphosphane

• Diphosphordihydrid
• Diphosphine
• Diphosphene

-99 ° C

52 ° C.

Poorly in water

Template: Infobox chemical / molecular formula search available

Diphosphine is one of the phosphines and is a binary phosphorus hydride with the formula P2H4. Above -99 ° C, it is in the form a colorless liquid. In air, it is not stable, but spontaneously ignites. Moreover, disproportionated at temperatures above -30 ° C and higher PH3 phosphines. It is often found as an impurity in commercially available monophosphane.

Production

Diphosphine can be obtained by hydrolysis of Calciummonophosphid ( Ca2P2 ):

The hydrolysis yields 400 g Ca2P2 at -30 ° C. about 20 g P2H4. As contamination subject to an additional phosphines.

Properties and reactions

Diphosphine is a colorless, spontaneously flammable in air liquid, which decomposes in the presence of traces of acid, at temperatures above -10 ° C (especially under the influence of light) as well as on rough surfaces. It is miscible with carbon disulfide, pyridine, hydrocarbons, ethers, Diäthylenglykolmonomethylether, diethylene glycol dimethyl ether, hexamethylphosphoramide, and are soluble in methanol. It is in the gauche conformation, with a distance of 2.219 angstroms PP. The 1H NMR spectrum consists of 32 lines from the A2XX'A'2 splitting.

The reaction of diphosphine with butyllithium leads to various condensed polyphosphanes.

Organic diphosphanes

There are known various organic derivatives of diphosphine. Here are some or all of the hydrogen atoms are substituted by organyl. They are synthesized by reductive coupling, for example, from chlorodiphenylphosphane:

The methyl derivative P2Me4 obtained by reaction of methylmagnesium bromide with Thiophosphoryltrichlorid.

Swell

• Phosphine
• Hydrogen compound