Electron paramagnetic resonance and nuclear spin echo in solutions of oxyfluorides of pentavalent molybdenum

Summary

• 1. Acid solutions of the salts (NH₄)₂[MoOF₅], Zn[MoOF₅], K₂[MoOF₅],and Cu[MoOF₅] dissociate into the complex anion [MoOF₅] and the cations K⁺, Zn²⁺, (NH₄)⁺, and Cu²⁺.

• 2. In the complex anion [MoOF₅]⁻², a super hyperfine structure from the four F¹⁹ nuclei is observed as a result of the formation of covalent bonds of the ligands of F¹⁹ with the complex former.

• 3. The long lifetime of the ligands of F¹⁹ in the complex reduces the effectiveness of Mo(V) on the nuclear relaxation of F¹⁹; when the solution temperature is raised, the effectiveness increases as a result of the decrease in the lifetime of F¹⁹ in the complex.

• 4. In the complex [MoOF₅]⁻², the magnetic ion Mo(V) is found inside the octahedron formed from five covalently bonded atoms: four fluorine atoms and one oxygen atom. The fifth fluorine atom, situated in the transposition to the oxygen, possesses an ionic bond.