Nomenclature
CAS number: 4493-37-2
C
2H
2CrO
4; mol wt 142.03.
C 16.91%, H 1.42%, Cr 36.61%, O 45.06%.
Cr(HCOO)
2.
Description and 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
Hemihydrate.
Properties
Violet to blue crystals. Sol in water.Derivative
Monohydrate.
Properties
Red needles. Sol in water to give blue soln.Derivative
Hemipentahydrate.
Properties
Large, dark-red cubic crystals. Sol in water,
alcohol, ether, acetone.Use
In baths for Cr electroplating; in catalysts for
organic reactions.