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Area of Science:

  • Inorganic Chemistry
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Understanding metal-ligand interactions is crucial in inorganic chemistry.
  • The reactivity of early transition metals and lanthanides with ammonia is of significant interest.
  • Investigating reaction mechanisms provides insights into chemical transformations.

Purpose of the Study:

  • To investigate the reaction pathways between cerium atoms and ammonia.
  • To elucidate the intermediate species and final products formed.
  • To compare the reactivity of cerium with other metals (Ti, Zr, Hf, Th) towards ammonia.

Main Methods:

  • Infrared spectroscopy was used to identify reaction products in solid argon.
  • Density Functional Theory (DFT) calculations were employed to model reaction mechanisms and predict stable structures.
  • Annealing and irradiation techniques were utilized to induce and study chemical reactions.

Main Results:

  • Spontaneous formation of CeNH3 complex upon annealing was observed.
  • CeNH3 rearranges to HCeNH2 upon irradiation, involving a triplet-singlet spin conversion.
  • HCeNH2 isomerizes to H2CeNH, which then photolyzes to HCeN and H2.
  • DFT predicts triplet ground state for HCeNH2, contrasting with singlet for Hf and Th analogues due to relativistic effects.

Conclusions:

  • The reaction proceeds through distinct intermediates involving cerium-ammonia complexes.
  • Spin state plays a critical role in the isomerization and decomposition pathways.
  • Relativistic effects influence the ground state spin multiplicity in related metal-ammonia systems.