22541-79-3

Basic information

• Product Name: chromium(2+)
• Synonyms: Chrom(2+); Chrome(2+)
• CAS NO: 22541-79-3
• Molecular Formula: Cr
• Molecular Weight: 51.995
• Mol File: 22541-79-3.mol
• Article Data: 9

Chemical Properties

• CAS DataBase Reference: chromium(2+)(CAS DataBase Reference)
• NIST Chemistry Reference: chromium(2+)(22541-79-3)
• EPA Substance Registry System: chromium(2+)(22541-79-3)

Safety Data

• Hazardous Substances Data: 22541-79-3(Hazardous Substances Data)

Upstream product

• 7440-47-3 chromium 
• 16961-83-4 fluorosilicic acid 
• 7758-95-4 lead(II) chloride 
• 7440-43-9 cadmium 
• 7440-31-5 tin 
• 10025-73-7 chromium(III) chloride 
• 7440-66-6 zinc 
• 155026-88-3 superoxochromium(III) ion 
• 19476-67-6 hexamminechromium(II)⁽²⁺⁾ 
• 10097-32-2 bromide 
• 7722-84-1 dihydrogen peroxide 
• 16065-83-1 chromium (III) ion 

Downstream Products

• 14873-01-9 chromium(III) hexahydrate cation 
• 22541-53-3 cobalt(II) 
• 16065-83-1 chromium (III) ion 
• 780-24-5 dibenzylmercury(II) 
• 15955-81-4 [Cr(Hedta)(OH₂)] 
• 113705-88-7 {Cr(II)(OH₂)5(1,3-diphenylpropane-1,3-dionato)}⁽¹⁺⁾ 
• 16091-77-3 Cr(edta)^(1-) 
• 16089-60-4 uranium⁽⁴⁺⁾ 
• 22541-75-9 titanium(III) 
• 22541-90-8 tin(II) 
• 22541-77-1 vanadium(III) 
• 105311-69-1 {(H₂O)5CrO(NH₂)CCH₃}⁽³⁺⁾ 
• 15117-53-0 35S-H₂S 

Relevant articles and documents

The solid-state electrochemistry of metal octacyanomolybdates, octacyanotungstates, and hexacyanoferrates explained on the basis of dissolution and reprecipitation reactions, lattice structures, and crystallinities

The electrochemical behavior of solid microparticles of metal (Ag+, Cd2+, Co2+, Cr2+, Cu2+, Fe2+, Mn2+, Ni2+, Pb2+, and Zn2+) octacyanomolybdates, octacyanotungstates, and hexacyanoferrates has been studied by voltammetry, electrochemical quartz crystal microbalance, and microscopic diffuse reflectance spectroelectrochemical measurements. The solid microparticles have been immobilized on the surface of graphite electrodes prior to the electrochemical measurements. A comparative study of the cyclic oxidation and reduction of these compounds in the presence of potassium ions revealed that any interpretation of the electrochemistry requires the solubility equilibria of the reduced compounds to be taken into account, such as in the case of the silver salts {Ag3K[X]} and {Ag4[X]} (with X = Fe(II)(CN)6/4-, M(IV)(CN)8/4- (M = Mo, W)). Because {Ag4[X]} has a lower solubility than {Ag3K[X]}, the electrochemistry is accompanied by a conversion of solid {Ag3K[X]} into solid {Ag4[X]}. Two distinct voltammetric signal systems are generated by these two compounds according to {Ag3K[X]} ? {Ag3-[X]} + K+ + e- and {Ag4[X]} ? {Ag3[X]} + Ag+ + e-. When silver ions are present in the solution adjacent to the microparticles, the silver octacyanometalates and silver hexacyanoferrate show a chemically reversible and very stable voltammetric behavior. Despite the fact that the electrochemistry is based upon a single-electron/single-ion transfer reaction ({Ag4[X]} ? {Ag3[X]} + Ag+ + e-), more than one electrochemical signal is observed because of the simultaneous presence of amorphous and crystalline particles. This study shows that the interplay of solubility equilibria and electrochemical equilibria is generally observed for the other metal octacyanomolybdates, octacyanotungstates, and hexacyanoferrates as well.

Catalytic oxidation of the (hydroxymethyl)chromium(III) ion by the superoxochromium(III) ion

The superoxochromium(III) ion, CrO22+, is an efficient catalyst for autoxidation of the (hydroxymethyl)chromium(III) ion, CrCH2OH2+, in aqueous solution. The reaction involves one-electron oxidation of CrCH2OH2+ by CrO22+, k = 137 M-1 s-1, to yield Cr2+, CH2O, and the novel (hydroperoxo)chromium(III) ion, CrO2H2+. The Cr2+ produced reacts rapidly with O2 to regenerate the catalyst, CrO22+. When oxygen is depleted, the Cr2+ reacts instead with CrO22+ to produce the chromyl(IV) ion, CrO2+. This initiates a chain reaction that rapidly consumes the remaining CrO22+ and a stoichiometric amount of CrCH2OH2+.