The Reaction Product between Urea and Molybdic Acid

Abstract

Preparation and properties of a new compound, urea molybdate, are described.
Urea reacts with molybdic acid in aqueous medium to give a white precipitate.
The compound is a white, anhydrous, crystalline powder. Chemical analysis and X-ray powder diffraction study reveals that the compound can be represented by H2Mo207e2CO(NH2)20r H2Mo30ige3CO(NH2)2, or by a mixture of these formulae. lt is semewhat soluble in water, dimethylsulfoxide, methanol and ethanol but is insoluble in various organisolvents.
Conductivity and molecular weight measurements of urea molybdate in dilute aqueous solutions show that the compound is completely disseciated into urea and molybdic acid in the medium. The density is 2.558 v2.571 g/cmg (at 250C) and refractive index (nD) is 1.769. vl.770. Urea molybdate is fairly stable up to about 200eC, but deomposes at 240. v2550C and changes completely into MoOg at 2900C, which is indicated by TG thermogram and DTA curve.