Magnesium Hydride - Structure and Bonding

Structure and Bonding

The room temperature form β-MgH2 has a rutile structure. There are two high pressure forms, α-MgH2 with α-PbO2 structure and γ-MgH2. Additionally a non stoichiometric MgH(2-δ) has been characterised, but this appears to exist only for very small particles
(bulk MgH2 is essentially stoichiometric, as it can only accommodate very low concentrations of H vacancies).

The bonding in the rutile form is sometimes described as being covalent in nature rather than purely ionic; charge density determination by synchrotron x-ray diffraction indicates that the magnesium atom is fully ionised and spherical in shape and the hydride ion is elongated. Molecular forms of magnesium hydride, MgH, MgH2, Mg2H, Mg2H2, Mg2H3, and Mg2H4 molecules identified by their vibrational spectra have been found in matrix isolated samples at below 10 K, formed following laser ablation of magnesium in the presence of hydrogen. The Mg2H4 molecule has a bridged structure analogous to dimeric aluminium hydride, Al2H6.

Read more about this topic:  Magnesium Hydride

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