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Iron(III) hexacyanidoferrate(II)

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Chemical structure of iron(III) hexacyanidoferrate(II)

Iron(III) hexacyanidoferrate(II) is an inorganic compound with formula Fe4[Fe(CN)6]3.

Table of contents
  1. 1Names
  2. 2Formulae and structures
  3. 3Properties
  4. 4Constituents
  5. 5Thermodynamic properties
  6. 6Solubility
  7. 7Preparations
  8. 8Chemical reactions
  9. 9References
  10. 10Related substances
  11. 11Related categories
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Names

List of substance names

Nomenclature
Name
Typical name
Iron(III) hexacyanidoferrate(II)
Compositional nomenclature
Iron(III) hexacyanidoferrate(II)
Tetrairon tris(hexacyanidoferrate)
Additive nomenclature
Iron(3+) hexacyanidoferrate(4−)
Other names
Iron(III) ferrocyanide
Ferric ferrocyanide
Iron(III) hexacyanoferrate(II)
Prussian blue
Berlin blue
Turnbull's blue
Paris blue

Formulae and structures

List of formulae

Formula name
Formula
Typical formula
Fe4[Fe(CN)6]3
Compositional formula
Fe4[Fe(CN)6]3
Structural formula
Chemical structure of iron(III) hexacyanidoferrate(II)
Lewis structure
Lewis structure of iron(III) hexacyanidoferrate(II)
Colored Lewis structure
Colored Lewis structure of iron(III) hexacyanidoferrate(II)

Properties

List of substance properties

Item
Value
Name
Iron(III) hexacyanidoferrate(II)
Formula
Fe4[Fe(CN)6]3
Appearance
Dark blue solid
Odor
Odorless
Molar mass
859.239 g/mol
Density
1.80 g/cm3[1]
Solid
Melting point
250 °C[1]
Boiling point
–

Constituents

Constituent ions

IonNameCharge numberNumber
Fe3+Iron(III) ion34
[Fe(CN)6]4−Hexacyanidoferrate(II) ion-43

Constituent atoms

AtomNameOxidation stateNumber
FeIron+34
FeIron+23
CCarbon+218
NNitrogen−318

Ratio of atoms

AtomAtomic weightNumberAtomic ratioWeight ratio
Fe55.845716.28%45.50%
C12.0111841.86%25.16%
N14.0071841.86%29.34%
FeCNAtomic ratio
FeCNWeight ratio

Thermodynamic properties

Phase transition properties

Item
Value
Enthalpy of fusion
–
Enthalpy of vaporization
–
Enthalpy of vaporization at 25°C
–
Enthalpy of other transition
–

Solubility

Qualitative solubility

Reactive
Miscible
Very soluble
Soluble
HCl (aq)[1]Hydrochloric acid
Slightly soluble
Very slightly soluble
Insoluble
H2O[1]Water

Preparations

Reaction of basic oxide and acid

The reaction of iron(II,III) oxide and hydrogen cyanide yields iron(III) hexacyanidoferrate(II), iron(III) hexacyanidoferrate(III), and water.

Reaction of iron(II,III) oxide and hydrogen cyanide
3Fe3O4Iron(II,III) oxide + 24HCNHydrogen cyanide
⟶
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III) + 12H2OWater

Precipitation reaction

When iron(III) ion and hexacyanidoferrate(II) ion react in aqueous solution, a precipitate of iron(III) hexacyanidoferrate(II) is formed.

Reaction of iron(III) chloride and sodium hexacyanidoferrate(II)
4FeCl3Iron(III) chloride + 3Na4[Fe(CN)6]Sodium hexacyanidoferrate(II)
💧
⟶
Fe4[Fe(CN)6]3↓Iron(III) hexacyanidoferrate(II) + 12NaClSodium chloride
Reaction of iron(III) bromide and sodium hexacyanidoferrate(II)
4FeBr3Iron(III) bromide + 3Na4[Fe(CN)6]Sodium hexacyanidoferrate(II)
💧
⟶
Fe4[Fe(CN)6]3↓Iron(III) hexacyanidoferrate(II) + 12NaBrSodium bromide
Reaction of iron(III) iodide and sodium hexacyanidoferrate(II)
4FeI3Iron(III) iodide + 3Na4[Fe(CN)6]Sodium hexacyanidoferrate(II)
💧
⟶
Fe4[Fe(CN)6]3↓Iron(III) hexacyanidoferrate(II) + 12NaISodium iodide
Reaction of iron(III) chloride and potassium hexacyanidoferrate(II)
4FeCl3Iron(III) chloride + 3K4[Fe(CN)6]Potassium hexacyanidoferrate(II)
💧
⟶
Fe4[Fe(CN)6]3↓Iron(III) hexacyanidoferrate(II) + 12KClPotassium chloride
Reaction of iron(III) bromide and potassium hexacyanidoferrate(II)
4FeBr3Iron(III) bromide + 3K4[Fe(CN)6]Potassium hexacyanidoferrate(II)
💧
⟶
Fe4[Fe(CN)6]3↓Iron(III) hexacyanidoferrate(II) + 12KBrPotassium bromide

Chemical reactions

Electrolytic dissociation

Electrolytic dissociation of iron(III) hexacyanidoferrate(II) yields iron(III) ion and anion.

Electrolytic dissociation of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
4Fe3+Iron(III) ion + 3[Fe(CN)6]4−Hexacyanidoferrate(II) ion
Electrolytic dissociation of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
Fe3+Iron(III) ion + 3Fe2+Iron(II) ion + 3[Fe(CN)6]3−Hexacyanidoferrate(III) ion

Reaction with strong acid

The reaction of iron(III) hexacyanidoferrate(II) and strong acid yields salt of strong acid and hydrogen cyanide.

Reaction of iron(III) hexacyanidoferrate(II) and hydrogen chloride
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18HClHydrogen chloride
⟶
4FeCl3Iron(III) chloride + 3FeCl2Iron(II) chloride + 18HCNHydrogen cyanide
Reaction of iron(III) hexacyanidoferrate(II) and hydrogen bromide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18HBrHydrogen bromide
⟶
4FeBr3Iron(III) bromide + 3FeBr2Iron(II) bromide + 18HCNHydrogen cyanide
Reaction of iron(III) hexacyanidoferrate(II) and hydrogen iodide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18HIHydrogen iodide
⟶
4FeI3Iron(III) iodide + 3FeI2Iron(II) iodide + 18HCNHydrogen cyanide
Reaction of iron(III) hexacyanidoferrate(II) and sulfuric acid
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 9H2SO4Sulfuric acid
⟶
2Fe2(SO4)3Iron(III) sulfate + 3FeSO4Iron(II) sulfate + 18HCNHydrogen cyanide
Reaction of iron(III) hexacyanidoferrate(II) and nitric acid
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18HNO3Nitric acid
⟶
4Fe(NO3)3Iron(III) nitrate + 3Fe(NO3)2Iron(II) nitrate + 18HCNHydrogen cyanide

Reaction with strong base

The reaction of iron(III) hexacyanidoferrate(II) and strong base yields salt of strong base and iron(III) hydroxide.

Reaction of iron(III) hexacyanidoferrate(II) and sodium hydroxide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 12NaOHSodium hydroxide
⟶
3Na4[Fe(CN)6]Sodium hexacyanidoferrate(II) + 4Fe(OH)3Iron(III) hydroxide
Reaction of iron(III) hexacyanidoferrate(II) and potassium hydroxide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 12KOHPotassium hydroxide
⟶
3K4[Fe(CN)6]Potassium hexacyanidoferrate(II) + 4Fe(OH)3Iron(III) hydroxide
Reaction of iron(III) hexacyanidoferrate(II) and sodium hydroxide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18NaOHSodium hydroxide
⟶
18NaCNSodium cyanide + 4Fe(OH)3Iron(III) hydroxide + 3Fe(OH)2Iron(II) hydroxide
Reaction of iron(III) hexacyanidoferrate(II) and potassium hydroxide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18KOHPotassium hydroxide
⟶
18KCNPotassium cyanide + 4Fe(OH)3Iron(III) hydroxide + 3Fe(OH)2Iron(II) hydroxide
Reaction of iron(III) hexacyanidoferrate(II) and calcium hydroxide
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 9Ca(OH)2Calcium hydroxide
⟶
9Ca(CN)2Calcium cyanide + 4Fe(OH)3Iron(III) hydroxide + 3Fe(OH)2Iron(II) hydroxide

Reaction with oxidizing species

The reaction of iron(III) hexacyanidoferrate(II) and oxidizing species yields a variety of products.

Reaction of iron(III) hexacyanidoferrate(II) and oxygen
4Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 3O2Oxygen
⟶
2Fe2O3Iron(III) oxide + 12Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III)
Reaction of iron(III) hexacyanidoferrate(II) and chlorine
2Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 3Cl2Chlorine
⟶
2FeCl3Iron(III) chloride + 6Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III)
Reaction of iron(III) hexacyanidoferrate(II) and nitric acid
2Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 42HNO3Nitric acid
⟶
14Fe(NO3)3Iron(III) nitrate + 36HCNHydrogen cyanide + 3H2↑Hydrogen
Reaction of iron(III) hexacyanidoferrate(II) and nitric acid
2Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 6HNO3Nitric acid
⟶
2Fe(NO3)3Iron(III) nitrate + 6Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III) + 3H2↑Hydrogen
Reaction of iron(III) hexacyanidoferrate(II) and oxygen
4Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 147O2Oxygen
⟶
24Fe(NO3)3Iron(III) nitrate + 2Fe2O3Iron(III) oxide + 72COCarbon monoxide

Reaction with reducible species

The reaction of iron(III) hexacyanidoferrate(II) and iodine yields iron(III) iodide and iron(III) hexacyanidoferrate(III).

Reaction of iron(III) hexacyanidoferrate(II) and iodine
2Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 3I2Iodine
⟶
2FeI3Iron(III) iodide + 6Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III)

Reaction with reducing species

The reaction of reducing species and iron(III) hexacyanidoferrate(II) yields a variety of products.

Reaction of hydrogen and iron(III) hexacyanidoferrate(II)
9H2Hydrogen + Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
7FeIron + 18HCNHydrogen cyanide
Reaction of hydrogen and iron(III) hexacyanidoferrate(II)
27H2Hydrogen + Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
7FeIron + 18NH3Ammonia + 18CCarbon
Reaction of sodium and iron(III) hexacyanidoferrate(II)
18NaSodium + Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
18NaCNSodium cyanide + 7FeIron
Reaction of sodium and iron(III) hexacyanidoferrate(II)
12NaSodium + Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
3Na4[Fe(CN)6]Sodium hexacyanidoferrate(II) + 4FeIron
Reaction of hydrogen sulfide and iron(III) hexacyanidoferrate(II)
9H2SHydrogen sulfide + Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
⟶
9SSulfur + 7FeIron + 18HCNHydrogen cyanide

Hydrolysis

The reaction of iron(III) hexacyanidoferrate(II) and water yields iron(III) hydroxide, iron(II) hydroxide, and hydrogen cyanide.

Hydrolysis of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II) + 18H2OWater
⟶
4Fe(OH)3Iron(III) hydroxide + 3Fe(OH)2Iron(II) hydroxide + 18HCNHydrogen cyanide

Molten salt electrolysis

Molten salt electrolysis of iron(III) hexacyanidoferrate(II) yields a variety of products.

Molten salt electrolysis of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
🔥⚡
⟶
3Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III) + FeIron
Molten salt electrolysis of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
🔥⚡
⟶
FeIron + 3Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III)

Decomposition

Decomposition of iron(III) hexacyanidoferrate(II) yields a variety of products.

Decomposition of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
️☀️
⟶
3Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III) + FeIron
Decomposition of iron(III) hexacyanidoferrate(II)
Fe4[Fe(CN)6]3Iron(III) hexacyanidoferrate(II)
️☀️
⟶
FeIron + 3Fe[Fe(CN)6]Iron(III) hexacyanidoferrate(III)

References

List of references

  1. 1
    James G. Speight (2017)
    Lange's Handbook of Chemistry, 17th edition
    McGraw Hill Education
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