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By Boschke F.L.

Content material: Tsigdinos, G. A. Heteropoly compounds of molybdenum and tungsten. -- Tsigdinos, G. A. Inorganic sulfur compounds of molybdenum and tungsten -- their coaching, constitution, and homes. -- Moh, G. High-temperature steel sulfide chemistry

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Aspects of Molybdenum and Related Chemistry

Content material: Tsigdinos, G. A. Heteropoly compounds of molybdenum and tungsten. -- Tsigdinos, G. A. Inorganic sulfur compounds of molybdenum and tungsten -- their guidance, constitution, and homes. -- Moh, G. High-temperature steel sulfide chemistry

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Extra info for Aspects of Molybdenum and Related Chemistry

Example text

With arsenic, these compound types are the most stable and best known heteropolymolybdates and tungstates. It has been shown recently that the 12-molybdoarsenate(V) anion is stable in 1 : 1 water dioxane solutions 1s). In addition to alkaline degradation, 12-molybdophosphates are decomposed by excess of certain acids, such as phosphoric, iodic, periodic, hydrofluoric, and concentrated hydrochloric or sulfuric acid. These acidic decompositions may convert Table 14. Equilibria in molybdate-phosphate solutions as a function of hydrogen ion concentration (Ref.

This acid has been employed in developing chromatograms for thiamine 252) and methyl test 0 st crone 2sa) 12-Molybdosilic acid has been employed in the isolation of alkaloids from biological fluids2s4) and as a reagent for choline2ss).

293). 4. molybdophosphoric acid, hydrolytic degradation begins before neutralization of the three acidic hydrogens is complete. The anion is almost certainly intact as [PMo 12040]-a in very acidic solutions s). 93~ Isolation of the 11-salt, NaT [PMo 11039 ] " xH20, has been claimed. 11-Tungstoborates cannot be obtained by direct degradation of the 12-tungstoborate anion but are prepared directly from acidified solutions of tungstate and borate 4). They are stable over a limited pH range. The 12-molybdoarsenates are even less stable than the 12-molybdophosphates.

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