Chromous Formate
Title: Chromous Formate
CAS Registry Number: 4493-37-2
Molecular Formula: C2H2CrO4
Molecular Weight: 142.03
Percent Composition: C 16.91%, H 1.42%, Cr 36.61%, O 45.06%
Line Formula: Cr(HCOO)2
Literature References: Prepd from CrCl2 and Na formate: Lux, Illman, Ber. 91, 2143 (1958); Earnshaw et al., Proc. Chem. Soc. London 1963, 281. Prepn of blue and red anhydrous forms from hydrated formates: Herzog, Kalies, Z. Chem. 5, 273 (1965).
 
Derivative Type: Hemihydrate
Properties: Violet to blue crystals. Sol in water.
 
Derivative Type: Monohydrate
Properties: Red needles. Sol in water to give blue soln.
 
Derivative Type: Hemipentahydrate
Properties: Large, dark-red cubic crystals. Sol in water, alcohol, ether, acetone.
 
Use: In baths for Cr electroplating; in catalysts for organic reactions.

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