Manganese II carbonate

The reaction of MnC03 is of particular interest because of the possibility of the formation and interconversion of the various oxides of manganese [733,1276], Westerdahl and Leader [762] identify the initial process as 

However, within appropriate conditions of temperature and Pco, reduction can occur, viz. 

MnO is the overwhelmingly predominant product in inert [763,764] and in static [762] atmospheres. In nitrogen at 611—661 K, the sigmoid a— time curve obeys [765] the Prout—Tompkins equation [eqn. (9)] and E = 123 kJ mole 1. 

---

A rapid method of preparation of [Mn(NH20H)2Cl2] has been reported that is easily carried out and does not require the use of hydroxylamine. It involves treatment of manganese(ii) carbonate with hydroxylamine hydrochloride in boiling water. The complexes formed between Mn and tetramethyl- and tetraethyl-dithio-oxamide have been investigated by the Job method MnL3X2 (X = C10 or FeCl4 ) were observed. ... 

Manganese(II) carbonate occurs in nature as the mineral rhodochrosite [14476-12-1] (manganese spar). This ore also is used to produce manganese dioxide (by electrolytic process). The pure compound is used as gemstones and as a pigment (manganese white). 

Anhydrous chloride can he prepared hy heating manganese(II) oxide or manganese(II) carbonate with dry hydrogen chloride or hy hurning the metal in chlorine at 700°C to 1,000°C. 

The oxide also can be made by thermal decomposition of manganese(II) carbonate or manganese(II) oxalate in the absence of air ... 

Manganese(lV) oxide may also he made by thermal decomposition of man-ganese(II) nitrate or from roasting manganese(II) carbonate in air ... 

Manganese is mainly present as manganese (II) carbonates, but in some sediments and on weathering surfaces it is present as higher oxides such as manganite and pyrolusite. In some pelagic sediments the amount... 

Different particulate manganese(II) mixtures for MR imaging have been prepared. Manganese(II) carbonate particles have a Rj value of 0.06 mM"1 s 1 in water at 20 MHz and 40 °C and the R2 values varied depending on the echo time... 

Heavy metal impurities are precipitated from the resulting solution as carbonates by adding further manganese(II) carbonate. 

After separation and washing, the manganese II) carbonate obtained has to be dried at I20°C under inert gas to avoid oxidation. 

Hamada, S. et al.. Preparation of monodispersed manganese(IV) oxide particles from manganese(II) carbonate, J. Colloid Intetf. Sci., 118, 356, 1987. 

Manganese(II) carbonate MnCOj +11400 Nickel(II) chloride NiCl2 +6145... 

M S04 Mn2(S04>3 24H2O manganese(II) carbonate hydroxyphenylacetic acid manganese hydroxide monoammonium phosphate potassium tm(II) sulphate ammonium sulphate yellow lead monoxide ammonium hydrogen fluoride potassium iron(III) sulphate mercury(n) isocyanate hexamethylbenzene tetramethyldiamino-benzophenone... 

Regulatory FDA 21CFR 175.300, 181.25 Manganese carbonate CAS 598-62-9 EINECS/ELINCS 209-942-9 Synonyms Manganese (II) carbonate Manganous carbonate Rhodocrosite Classification Carbonate Empirical CMnOs Formula MnCOs... 

---