Aqueous Crystallization of Manganese(II) Group 6 Metal Oxides

Aqueous salt metathesis reactions of manganese(II) salts and various chromate, molybdate, and tungstate salts afford a series of manganese group 6 metal oxides. The chromate reactions form a previously unknown phase, KMn2(CrO4)2(OH)(H2O) (1), whereas the tungstate reactions afford a simpler, hydrate...

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Bibliographic Details
Published in:Chemistry of materials 2001-02, Vol.13 (2), p.519-525
Main Authors: Jang, Meehae, Weakley, Timothy J. R, Doxsee, Kenneth M
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from solutions
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:Aqueous salt metathesis reactions of manganese(II) salts and various chromate, molybdate, and tungstate salts afford a series of manganese group 6 metal oxides. The chromate reactions form a previously unknown phase, KMn2(CrO4)2(OH)(H2O) (1), whereas the tungstate reactions afford a simpler, hydrated phase, MnWO4·H2O (4). In these reactions, the countercation appears to influence the crystal form and size of the products. The molybdate reactions display countercation-dependent phase selectivity. Sodium and ammonium molybdates afford hydrated manganese molybdenum oxide, MnMoO4·H2O (3), whereas potassium molybdate affords the new molydenum analogue of the chromate phase, KMn2(MoO4)2(OH)(H2O) (2). Counteranion effects are more subtle, with crystal form and size representing the primary differences between the products from reactions using sulfate, acetate, or chloride salts of manganese(II). Each phase undergoes thermal dehydration, affording α-MnMoO4 from 3 and MnWO4 (hübnerite) from 4.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm000754c