Ammonium heptamolybdate tetrahydrate

Ammonium Heptamolybdate Solution Dissolve 100 g of ammonium heptamolybdate tetrahydrate [(NH4)5Mo7024 4H20] in 900 mL of water in a 1000-mL volumetric flask. Add 10 mL of 25% ammonia solution, dilute to volume with water, and mix. This solution is stable for 4 weeks when stored at ambient temperature and shielded from light. 

In a further exanple. Smith and Wan exploited the nucleophilic capability of l-phenyl-2-tetrazoline-5-thione in the Mitsunobu reaction, followed by oxidation to the sulfone with hydrogen peroxide and ammonium heptamolybdate tetrahydrate as a key step in a synthesis of the ansamycin antiobiotic, (+ )-thiazinotrienomycin-E (eq 8). Importantly, use of the phenyltetrazolylthione-derived sulfone gave an 13Z ratio of 10 1 in this coupling whereas the more conventional benzthiazole-2-thiol-derived system resulted in a selectivity of only 1.5 1 in favor of the -isomer. 

Mixed reagent (flow-analysis) Dissolve lOg of ammonium heptamolybdate tetrahydrate, (NH4)6Mo7024 -4H20, in 600 mL of pure water. Carefully add 120 mL concentrated of sulphuric acid (d = 1.84 g/mL) and mix. Add 20 mL of a solution of 2.3 g potassium antimony tartrate, K(Sb0)C4H40g nH20 in 100 mL of pure water. Mix well and make up to 2 L. This mixed reagent is stable for several months. 

M0O3 nanofibers were synthesized by hydrothermal reaction from acidified ammonium heptamolybdate tetrahydrate precursor (Fig. 12.21). Structural analysis shows that M0O3 nanofibers 50-80 nm in diameter and a several micrometers in length are crystallized with the a-form in the orthorhombic system (Pbnm S.G.). The composition M0O2 9975 was determined by Rietveld refinement and magnetic susceptibility measurements. The electrochemical performance of Li/ZMoOs cells with... 

Synonyms AHM Ammonium heptamolybdate Ammonium molybdate Ammonium paramolybdate Hexaammonium molybdate Molybdate, hexaammonium Molybdic acid, ammonium salt, tetrahydrate Definition Avail, commercially as the tetrahydrate Empiricai H24M07N6O24 H24M07N6O24 4H2O Formuia (NH4)6M07024 (NH4)6Mo7024 4H2O Properties M.w. 1163.79 (anhyd.), 1235.86 (tetrahydrate) Tetrahydrate Colorless to si. grnsh.-ylsh. cryst. sol. 430 g/l in water pract. insol. in alcohol releases water 90 C pH 5.0-5.5 (5% aq.) nonflamm. 

AMMONIUM compounds). Diammonium dimolybdate [27546-07-2] (NH 2 2 7 " ble commercially as the tetrahydrate and prepared from MoO and excess NH in aqueous solution at 100°C, has an infinite chain stmcture based on MoO octahedra. In aqueous solution the behavior of Mo(VI) is extremely pH-dependent (4). Above pH 7 molybdenum(VI) occurs as the tetrahedral oxyanion MoO , but below pH 7 a complex series of concentration-, temperature-, and pH-dependent equiUbria exist. The best known of these equiUbria lead to the formation of the heptamolybdate,... 

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