Molybdogermanates

Molybdenum trisulfide, 3, 1431 Molybdoarsenates, 3, 1041 non-Keggin, 3, 1042 Molybdoarsenic acid liquid-liquid extraction, 1, 548 Molybdoborates, 3,1042 Molybdocerophosphoric add determination, 1, 548 Molybdoenzymes, 3, 1352 molybdenum site, 3,1391 Molybdogermanates, 3,1038 Molybdogermanic acid liquid-liquid extraction, 1, 548 Molybdoniobic acid... [Pg.170]

Molybdogermanic, molybdoniobic, molybdoarsenic and molybdosilicophosphoric acids and other heteropolyacids have been used in liquid-liquid extraction procedures which also permit the resolution of mixtures.68 A comprehensive review has been published.69... [Pg.548]

Variants of modern formulas. Some authors indicate whether the central atom is enclosed in a tetrahedron XO4 or an octahedron X06 thus [GeMo O ]-4 is sometimes written [GeO o C g]-4. Other authors rearrange formulas in different ways to indicate structure for example, [Ge(Mo301o)4]-4, shows that four groups of three Mo06 octahedra each surround the central atom in 12-molybdogermanates. [Pg.10]

The 12-molybdogermanic(IV) acid is also quite stable, although degradation sets in before all four replaceable hydrogen ions have been neutralized. The 11-molybdo-germanate(IV) anion is stable in the range of pH 3.5 to 4.293. Decomposition into germanate and molybdate starts above pH 4.2 and is complete at pH 5.4. [Pg.31]

Some heteropoly acids are easily decomposed in acid solution as has been shown by spectroscopic studies15 3 The order of increasing stability is 12-molybdophosphate, 12-molybdogermanate, 12-molybdosilicate, and 9-molybdophosphate153. ... [Pg.45]

Molybdcnum(V) complexes magnetic behavior, 271 spectra, 251 Molybdoarsenic acid liquid-liquid extraction, 548 Molybdocerophosphoric acid determination, 548 Molybdogermanic acid liquid-liquid extraction, 548 Molybdoniobic acid liquid-liquid extraction, 548 Molybdophosphates ammonium salt in gravimetry, 534 Molybdosilicophosphoric acid liquid-liquid extraction, 548 Mononuclear compounds neutral... [Pg.594]

In rare cases, an excess component L may cause a decrease in absorbance owing to the stepwise formation of higher-order complexes that have smaller e values at this wavelength. The composition of molybdogermanic acid has been studied by the molar-ratio method [13] showing a ratio of 36 molybdate 1 germanate. [Pg.178]

Mirzoyan, F. V., Tarayan, V. M., Khairyan, E. K., Sensitive Spectrophotometric Determination of Germanium as Methylene Blue 12-Molybdogermanate, Anal. Chim. Acta 124 [1981] 185/92. [Pg.20]

The slow acid hydrolysis of 12-molybdogermanic acid has been studied in 1— 11 mol dm HClOj ... [Pg.201]

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