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barium manganate
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Barium manganate is an inorganic compound with the formula BaMnO4. It is used as an oxidant in organic chemistry.〔Garry Procter, Steven V. Ley, Grant H. Castle, "Barium Manganate" Encyclopedia of Reagents for Organic Synthesis 2001. 〕 It belongs to a class of compounds known as manganates in which the manganese resides in a +6 oxidation state. Manganate should not to be confused with permanganate in which contains manganese(VII). Barium manganate is a powerful oxidant, popular in organic synthesis and can be used in a wide variety of oxidation reactions.
==Properties==
The manganate(VI) ion is a d1 ion and is tetrahedral with bond angles of approximately 109.5°. The Mn-O bond lengths in BaMnO4 and K2MnO4 are identical at 1.66 Å. In comparison, the Mn-O bond length in MnO4 2- is longer than in MnO4− of 1.56 Å and shorter than the Mn-O bond found in MnO2, 1.89 Å.〔Greenwood, Norman N.; Earnshaw, Alan (1984). ''Chemistry of the Elements''. Oxford:Pergamon Press. Vol. 15, "Manganese Compounds". ISBN 0-08-022057-6. 〕〔Jellinek, F. ''J. Inorg. Nucl. Chem.'' 1960. 13, 329-331. 〕 Barium manganate is isomorphous with BaCrO4 and BaSO4. Barium manganate can appear as a dark blue or green to black crystals.〔Firouzabadi, H.; Mostafavipoor,Z. (1983), "Barium Manganate. A Versatile Oxidant in Organic Synthesis", ''Bull. Chem. Soc. Jpn.'' 56 (3): p914-917. .〕 Barium manganate is indefinitely stable, active and can be stored for months in dry conditions.〔
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