Gallium
Hydrides

Like aluminium, gallium also forms a hydride, GaH, known as gallane, which may be produced by reacting lithium gallanate (LiGaH) with gallium(III) chloride at −30 °C:

In the presence of dimethyl ether as solvent, GaH polymerizes to (GaH). If no solvent is used, the dimer Ga H (digallane) is formed as a gas. Its structure is similar to diborane, having two hydrogen atoms bridging the two gallium centers, unlike α- AlH in which aluminium has a coordination number of 6.

Gallane is unstable above −10 °C, decomposing to elemental gallium and hydrogen.
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