Formation kinetics of a complex hydride YMn 2H 6 with [MnH 6] 5- complex anion from a metal hydride YMn 2H 4.5 was investigated in the temperature range between 373 K and 448 K under 25 MPa H 2. The time dependent of the YMn 2H 6 formation fraction suggested that the formation kinetics are controlled by random nucleation and growth with the activation energy of 113 kJ/mol H 2. Local structure of YMn 2H 6 synthesized was also studied by x-ray absorption fine structure analysis. Mn-H covalent bonding nature in [MnH 6] 5- complex anion was successfully detected and the Mn-H distance was determined to be 1.67 ± 0.05 Å.
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