K₄[Fe(CN)₆] is the chemical formula for Potassium Ferrocyanide, a coordination compound. It is a bright yellow crystalline solid and is an important reagent in chemistry labs and industry.
The related compound K₃[Fe(CN)₆] is called Potassium Ferricyanide (iron is in +3 oxidation state). It forms a Turnbull's Blue precipitate with Fe²⁺ ions.
| Property | Value |
|---|---|
| Chemical Name | Potassium Hexacyanoferrate(II) |
| Common Name | Potassium Ferrocyanide |
| Central Metal | Iron (Fe) |
| Ligand | Cyanide (CN⁻) — 6 ligands |
| Coordination Number | 6 |
| Geometry | Octahedral |
| Oxidation State of Fe | +2 |
| Hybridization of Fe | d²sp³ (inner orbital) |
Finding Oxidation State of Fe: Let oxidation state of Fe = x K has +1 charge (4 K atoms = +4), CN⁻ has -1 charge (6 CN⁻ = -6), overall charge = 0 → 4(+1) + x + 6(-1) = 0 → x = +2
The IUPAC name is **Potassium hexacyanoferrate(II)**. The (II) indicates the +2 oxidation state of iron. In coordination compound naming: ligands first (hexa = 6, cyano = CN), then metal with oxidation state.
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