Reaction of aqueous solutions of either lanthanum or cerium acetate with molybdenum(VI) oxide (MoO3) produces a mixed lanthanide molybdate acetate, Ln(O2CCH3)(MoO4).XH2O (Ln= La, Ce) that is an excellent single source precursor for stoichiometric Ln2Mo2O9. The reaction is very sensitive to the radius of the lanthanide metal used: metals with smaller radii (e.g. yttrium, praseodymium or neodymium) produce a hydroxyl molybdate product, M(OH)x(MoO4)1-x, instead of an acetate molybdate The products were characterized by thermal gravimetric analysis (TGA) and infrared and NMR spectroscopy. They were also calcined at elevated temperature to produce lanthanum molybdenum oxides. Furthermore, there is promising path for forming M2W2O9 as a bimetallic oxide where M can be either transition or lanthanide metals. Notably, reaction of aqueous solutions of lanthanum acetate with tungstic acid, H2WO4, produced lanthanum tungstate acetate. Also, reacting iron(III) nitrate with molybdenum(VI) oxide (MoO3) in acetate buffer produces iron hydroxy molybdate with the ratio of one iron to one molybdenum.

Synthesis of lanthanide and transition molybdates via reaction of molybdenum(VI) oxide and tungstic acid with aqueous acetate salts

ACS Fall 2021

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