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Molybdenum hydride VI (chemical formula MoH6) is a unstable volatile gas. Because of the high radius of molybdenum it quickly breaks down when it is not under pressure.

Structure
It is known to have a distorted trigonal prism structure. This structure follows the VSEPR Theory.

Properties
It is one of the components in which molybdenum has the maximum oxidation number +6 and having similar properties to H2Mo or H2S. It can be used as a oxidation agent in redox reactions.

Molybdenum hydride VI is an acidic hydride, because it manifests amphoteric properties. In reaction with most alkaline bases forms stable complexes.

Synthesis
Laser-ablated molybdenum atoms react with hydrogen gas upon condensation in excess argon and neon. Molybdenum gets oxidized by hydrogen till the maximum oxidation grade.

2Mo + H2   (hv)→ 2MoH  (+∆H)

2MoH + H2   (hv)→ 2H2Mo (+∆H)

H2Mo + H2   (hv)→ MoH4 (+∆H)

H2 + MoH4   (hv)→ MoH6 (+∆H)