Manganese (III) acetate
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Manganese (III) acetate | |||||||||||||||
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Molecular formula | C 6 H 9 MnO 6 | |||||||||||||||
Brief description |
red-brown solid |
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properties | ||||||||||||||||
Molar mass | 268.13 g mol −1 (dihydrate) | |||||||||||||||
Physical state |
firmly |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Manganese (III) acetate is a salt of trivalent manganese that is used as a mild and selective oxidizing agent. It belongs to the group of acetates with the constitutional formula Mn (CH 3 COO) 3 .
Extraction and presentation
Manganese (III) acetate dihydrate can be obtained by oxidizing manganese (II) acetate , which is dissolved in glacial acetic acid and heated. Potassium permanganate serves as the oxidizing agent :
Anhydrous manganese (III) acetate, on the other hand, can be obtained by reacting manganese (II) nitrate with acetic anhydride :
properties
Like the analogous acetates of iron and chromium , the anhydrous form is a trinuclear complex bridged by three acetate pairs with a central oxygen atom. It crystallizes as a linear coordination polymer in which an additional acetate ion serves as a bridge. The free coordination point on the third manganese atom is saturated by an acetic acid molecule . The chemical is therefore not a simple triacetate and is not properly represented by the often used simple formula "Mn (OAc) 3 ". The crystal structure of the hydrous form has not yet been clarified.
use
Manganese (III) acetate is used as:
- mild and selective oxidizing agent ,
- as a catalyst for allyl oxidations to generate alkenes ,
- as a reagent for the oxidative generation of radicals , e.g. for cyclizations ,
- as a starting material for acetoxylation reactions
Individual evidence
- ↑ a b c Data sheet Manganese (III) acetate dihydrate, 97% from Sigma-Aldrich , accessed on October 4, 2011 ( PDF ).
- ↑ Georg Brauer: Manganese (III) acetate . In: Handbook of Preparative Inorganic Chemistry . Ferdinand Enke Verlag, Stuttgart 1954, p. 1097-1098 .
- ↑ El-Ahmadi I. Heiba, Ralph M. Dessau, William J. Koehl Jr .: oxidation by metal salts. III. Reaction of manganic acetate with aromatic hydrocarbons and the reactivity of the carboxymethyl radical. In: J. Am. Chem. Soc. 1969, 91, 1, pp. 138-145, doi : 10.1021 / ja01029a028 .
- ↑ Hessel, LW; Romers, C .: The crystal structure of "anhydrous manganic acetate" . In: Recl. Trav. Chim. Pays-Bas . 88, 1969, pp. 545-552. doi : 10.1002 / recl.19690880505 .
- ↑ Nam Ho Lee, Jong Seok Baik, Sung-bin Han: Development of Manganese (III) Acetate along with Schiff-Base Ligands as the Catalyst for the Oxygenation of Olefins in the O 2 / NaBH 4 System. In: Bulletin of the Korean Chemical Society. Volume 25, 2004 ( online ( Memento of the original from September 27, 2007 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this note. )