Primary Solid Hydrides

Solid‐phase reactions as approach to the synthesis of organic compounds labelled with tritium

“…Usually, this is related to the processes taking place when catalysts are saturated with hydrogen. [66][67][68] According to a view proposed and substantiated on the basis of a study of the valence state of hydrogen in having a relatively great effective volume, the electron deficiency on the metal atoms that form the metal sublattice in the crystal structure of the catalyst should increase, which may restrict the reversible adsorption of hydrogen. This sharply decreases the concentration of activated species of tritium able to enter into exchange reactions and hence arrests almost completely the isotope exchange.…”

Neutron Powder Diffraction, x-ray absorption and Mössbauer spectroscopy on Mg 2 FeH 6

“…Therefore the ionic model fails to predict the FeeH and MgeH distances in the present case. The interatomic distances were studied by Gibb for different hydrides, who concluded that a good agreement between the observed and the calculated distances could be obtained by using r( VI H À ) ¼ 1.40 Å and r( IV H À ) ¼ 1.22 Å [30]. In the case of FeeH, the ionic radius for Fe 2þ in six-fold coordination and low-spin configuration, as previously reported, is 0.61 Å and FeeH bonds would be 2.01 Å , much larger than the experimental results (1.557(3) Å , Table 1).…”