Higher Oxidation States of Manganese

Higher Oxidation States of Manganese.—The manganese(iii) compound Mn(pic)3H20 (picH = pyridine-2-carboxylic acid) is readily formed by peroxydisulphate oxidation of aqueous manganese(ii) salts in the presence of the sodium salt of the acid. However, it has now been found that the oxidation proceeds further yielding polymeric compound [Mn(pic)20] which contains Mn—O—Mn linkages. 

It has been reported that in a lithium-potassium nitrate eutectic, Mn is stabilized as a blue suspension in solutions containing OH,  

Tisley, and R. A. Walton, Inorg. Nuclear Chem. Letters, 1973,9, 571. 

Arylazo-iron carbonyl cornpounds have been reported by two groups. Fisher and Sutton have found that Fe(CO)3(PPh3)2 reacts with [p-XCgH N2] BF (X = F, Cl, Br, H, NO2, OMe, OH, but not NEt2), replacing 

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Higher Oxidation States of Manganese.—When XeFj is heated with Mnp2 at 120 °C for 60 h, wine-red XeMnFj is formed. Magnetic data suggest that this is a complex of The electronic spectrum of CsjMnF has been... 

As for the higher oxidation states of manganese, a significant number of investigations involving pendant arm, polyaza macrocycles have been carried out. 

Removal of one or more of the inner d electrons or participation of these in bonding with electronegative atoms results in the various higher oxidation states of manganese, the +3, +4, +6, or +7 states. Derivatives of Mn(I) and Mn(V) have also been reported, but work on these has been fragmentary. 

The pink Mn24 ion is formed by reduction of the higher oxidation states of manganese in acid solution or by dissolving the me tab It is some-... 

Most of the coordination chemistry for the higher oxidation states of manganese involves the 3+ oxidation state a concise summary is provided by Cotton and Wilkinson (18). They include a discussion of the unusual structure for the manganese (III)-acetate complex ... 

The aqua ion can be obtained by electrolytic or peroxosulfate oxidation of Mn2+ solutions, or by reduction of Mn04. The ion plays a central role in the complex redox reactions of the higher oxidation states of manganese in aqueous solutions. It is most stable in acid solutions, since it is very readily hydrolyzed ... 

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