Cas no 26043-86-7 (Turnbull's blue)

Turnbull's blue is a synthetic inorganic pigment with the chemical formula Fe?[Fe(CN)?]?·xH?O, known for its deep blue coloration. It is formed by the reaction of ferrous (Fe2?) salts with ferricyanide ions. This compound exhibits excellent lightfastness and stability under standard conditions, making it suitable for applications in dyes, inks, and coatings. Its intense hue and resistance to fading are advantageous in artistic and industrial contexts. Turnbull's blue is also utilized in analytical chemistry as an indicator for ferric iron detection. The pigment's insolubility in water and organic solvents further enhances its durability in formulated products.
Turnbull's blue structure
Turnbull's blue structure
Product Name:Turnbull's blue
CAS No:26043-86-7
MF:C6Fe2KN6
MW:306.892702102661
CID:2653921
Update Time:2025-06-11

Turnbull's blue Chemical and Physical Properties

Names and Identifiers

    • potassium ferric ferrocyanide
    • K2CJI135MU
    • Turnbull's blue
    • C.I. Pigment Green 27
    • Potassium iron(III) hexacyanoferrate (II)
    • Potassium ferrihexacyanoferrate(II)
    • Iron potassium hexacyanoferrate(III)
    • Potassium ferrihexacyanoferrate (KFe2(CN)6)
    • iron(2+) iron(3+) potassium cyanide(1:1:1:6)
    • Inchi: 1S/6CN.2Fe.K/c6*1-2;;;/q6*-1;+2;+3;+1
    • InChI Key: LDQICAMJIICDLF-UHFFFAOYSA-N
    • SMILES: [Fe+3].[Fe+2].[K+].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-]

Computed Properties

  • Exact Mass: 306.852
  • Monoisotopic Mass: 306.852
  • Isotope Atom Count: 0
  • Hydrogen Bond Donor Count: 0
  • Hydrogen Bond Acceptor Count: 12
  • Heavy Atom Count: 15
  • Rotatable Bond Count: 0
  • Complexity: 10
  • Covalently-Bonded Unit Count: 9
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count : 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Topological Polar Surface Area: 143

Experimental Properties

  • Boiling Point: 25.7°Cat760mmHg
  • Flash Point: °C

Turnbull's blue Pricemore >>

Related Categories No. Product Name Cas No. Purity Specification Price update time Inquiry
City Chemical
F491-500GM
Ferrous Ferricyanide
26043-86-7 insoluble
500gm
$175.03 2023-09-19

Additional information on Turnbull's blue

Exploring Turnbull's Blue (CAS No. 26043-86-7): Properties, Applications, and Modern Relevance

Turnbull's Blue, with the CAS number 26043-86-7, is a historically significant and chemically intriguing compound. Often confused with Prussian Blue, this pigment has unique properties that distinguish it in both scientific and industrial contexts. Its deep blue hue and redox-active nature make it a subject of interest for researchers and manufacturers alike. In this article, we delve into its chemical structure, synthesis, and contemporary applications, addressing common queries such as "What is Turnbull's Blue used for?" and "How is Turnbull's Blue different from Prussian Blue?"

The compound Turnbull's Blue is chemically identified as iron(III) hexacyanoferrate(II), a coordination polymer with a cubic lattice structure. Its formation involves the reaction of ferric ions (Fe3?) with hexacyanoferrate(II) ions ([Fe(CN)?]??), resulting in its characteristic intense color. Unlike Prussian Blue, which forms from ferrous ions, Turnbull's Blue exhibits slight differences in its crystalline arrangement and magnetic properties. These nuances are critical in applications like electrochemical sensors and dye-sensitized solar cells, where its electron-transfer capabilities are leveraged.

In modern research, Turnbull's Blue has gained attention for its potential in sustainable technologies. For instance, its ability to adsorb heavy metals aligns with the growing demand for eco-friendly water purification solutions. Searches like "Can Turnbull's Blue remove pollutants?" reflect public interest in such applications. Additionally, its role in battery materials is being explored, particularly in sodium-ion batteries, as a cheaper alternative to lithium-based systems. This ties into broader discussions about renewable energy storage, a hot topic in 2024.

Art conservationists also value Turnbull's Blue for its stability and compatibility with traditional pigments. Questions like "Is Turnbull's Blue lightfast?" are common among conservators seeking durable materials for restoration. Meanwhile, in education, the compound serves as a classic example for teaching coordination chemistry and redox reactions, making it a staple in laboratory demonstrations worldwide.

From an industrial perspective, Turnbull's Blue is used in inks, coatings, and ceramics, where its colorfastness and non-toxicity are prioritized. Recent trends show increased searches for "non-toxic blue pigments," driven by stricter environmental regulations. This positions Turnbull's Blue as a viable option for manufacturers adapting to green chemistry principles. Its synthesis methods, including nanoparticle formulations, are also being optimized to enhance performance in high-tech applications.

Despite its niche status, Turnbull's Blue continues to inspire innovation. Whether in biomedical imaging (as a contrast agent) or smart materials (responding to environmental stimuli), its versatility keeps it relevant. As researchers address queries like "How to synthesize Turnbull's Blue nanoparticles?" or "Turnbull's Blue vs. Prussian Blue in catalysis," the compound’s story evolves, bridging historic chemistry with cutting-edge science.

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