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zinc hydride : ウィキペディア英語版
zinc hydride

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Zinc hydride is an inorganic compound with the chemical formula ZnH2. It is a white, odourless solid which slowly decomposes into its elements at room temperature; despite this it is the most stable of the binary first row transition metal hydrides.
A variety of coordination compounds containing Zn-H bonds are used as reducing agents, however ZnH2 itself has no common applications.
== Discovery and synthesis ==
Zinc(II) hydride was first synthesised in 1947 by Hermann Schlesinger, via a reaction between dimethylzinc and lithium aluminium hydride; a process which was somewhat hazardous due to the pyrophoric nature of Zn(CH3)2.
:Zn(CH3)2 + 2 LiAlH4 → ZnH2 + 2 LiAlH3CH3
Later methods were predominantly salt metathesis reactions between zinc halides and alkali metal hydrides, which are significantly safer.〔Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier ISBN 0-12-352651-5〕 Examples include:
:ZnBr2 + 2LiH → ZnH2 + 2LiBr
:ZnI2 + 2 NaH + → ZnH2 + 2NaI
:ZnI2 + 2 LiAlH4 → ZnH2 + AlH3 + 2LiI
Small quantities of gaseous zinc(II) hydride have also been produced by laser ablation of zinc under a hydrogen atmosphere and other high energy techniques. These methods have been used to assess its gas phase properties.

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