14459-95-1

Basic information

• Product Name: Potassium ferrocyanide trihyrate
• Synonyms: POTASSIUM PRUSSIATE, YELLOW;POTASSIUM FERROCYANIDE;POTASSIUM FERROCYANIDE(+2)TRIHYDRATE;POTASSIUM FERROCYANIDE 3H2O;POTASSIUM FERROCYANIDE 3-HYDRATE;POTASSIUM FERROCYANIDE(II) HYDRATE;POTASSIUM FERROCYANIDE(II) TRIHYDRATE;POTASSIUM FERROCYANIDE TRIHYDRATE
• CAS NO: 14459-95-1
• Molecular Formula: C6H6FeK4N6O3
• Molecular Weight: 422.39
• EINECS: 237-722-2
• Product Categories: Inorganic Chemicals;metal cyano complex;Iron Salts;Materials Science;Metal and Ceramic Science;Salts
• Mol File: 14459-95-1.mol
• Article Data: 0

Chemical Properties

• Melting Point: 70 °C(lit.)
• Boiling Point: 25.7oC at 760mmHg
• Appearance: Yellow/fine crystals
• Density: 1.85
• Vapor Pressure: 740mmHg at 25°C
• Storage Temp.: Store at RT.
• Solubility: H2O: 0.5 M at 20 °C, clear, yellow
• Water Solubility: 270 g/L (12 ºC)
• Stability: Stable. Incompatible with oxidizing agents, stong acids (may generate very toxic HCN). Not combustible.
• Merck: 14,7631
• CAS DataBase Reference: Potassium ferrocyanide trihyrate(CAS DataBase Reference)
• NIST Chemistry Reference: Potassium ferrocyanide trihyrate(14459-95-1)
• EPA Substance Registry System: Potassium ferrocyanide trihyrate(14459-95-1)

Safety Data

• Hazard Codes: Xn
• Statements: 32-20/21/22-52/53
• Safety Statements: 22-24/25-36-61-47
• RIDADR: 1588
• WGK Germany: 2
• RTECS: LJ9219000
• F: 8
• TSCA: Yes
• Hazardous Substances Data: 14459-95-1(Hazardous Substances Data)

Usage

Description

Potassium hexacyanoferrate(II) trihydrate, commonly known as potassium ferrocyanide trihydrate, is a pale yellow solid that is widely used as an anticaking agent. It has been evaluated for its cytotoxic and genotoxic effects and has been reported to exhibit growth in aqueous solutions on superhydrophobic surfaces. Additionally, its corrosion inhibition efficiency in phosphoric acid solutions against mild steel has been investigated.

Uses

Used in Chemical Industry:
Potassium ferrocyanide trihydrate is used as a moderately strong oxidizer when coupled with ferricyanide, making it a valuable component in various chemical reactions and processes.
Used in Solid-state Gas Sensors:
Potassium ferrocyanide trihydrate is used as a component in the formation of a xerogel via a cyanogel, which has potential applications in solid-state gas sensors due to its unique properties.
Used in Photography:
Potassium ferrocyanide trihydrate is used as a developer for some iron processes and as an additive for alkaline pyro developers, contributing to the development and enhancement of photographic images.
Used in Anticorrosion Applications:
Potassium ferrocyanide trihydrate is used as a corrosion inhibitor in phosphoric acid solutions, particularly for the protection of mild steel against corrosion, showcasing its effectiveness in industrial applications.

Preparation

Potassium hexacyanoferrate(II), K4Fe(CN)6·3H20, is obtained commercially from gasworks spent oxide (which contains Prussian blue) by treatment with lime and subsequent treatment of the solution with a soluble potassium salt ; the less soluble potassium hexacyanoferrate(II) can be crystallized from this mixture. In the laboratory it is readily prepared by treating aqueous iron(II) sulphate with an excess of potassium cyanide ; the initially precipitated iron(II) cyanide dissolves upon boiling in the excess of potassium cyanide solution and the ferrocyanide crystallizes on cooling.

Purification Methods

The anhydrous salt is prepared by drying at 110o over P2O5 in a vacuum desiccator. To obtain the trihydrate, it is necessary to equilibrate the salt in a desiccator over a saturated aqueous solution of sucrose and NaCl. It can also be precipitated from a saturated solution at 0o by adding an equal volume of cold 95% EtOH, setting aside for several hours, then centrifuge and wash with cold 95% EtOH. It is finally sucked air dry with water-pump vacuum. The anhydrous salt is obtained by drying the hydrate in a platinum boat at 90o in a slow stream of N2 [Loftfield & Swift J Am Chem Soc 60 3083 1938].

Structure and conformation

The trihydrate is diamagnetic and dimorphic existing in monoclinic (pseudotetragonal) and tetragonal forms. Its infrared spectrum in solution shows a single ν(C≡ N) at 2044 cm-1, but in the solid state a large number of bands are observed160; ν(Fe-C) occurs at 416cm-1. White, anhydrous K4Fe(CN)6 is obtained by dehydrating the trihydrate at 100°.

InChI:InChI=1/6CN.Fe.4K.3H2O/c6*1-2;;;;;;;;/h;;;;;;;;;;;3*1H2/q6*-1;+2;4*+1;;;