Sodium 4-Nitrophenolate Dihydrate

  • Chemical Formula : C6H4NO3Na·2H2O
  • CAS No : 824-78-2
  • EC No : 212-536-4
  • Purity : Minimum 93% as Dihydrate & 76.5% as Anhydrous
  • Packaging : The product is packed as 50kg net weight in HDPE woven bags with polyliner.
  • Moisture content : Free moisture maximum 6.5% & 23.5% including water of crystallisation

About the product

Sodium 4-nitrophenolate also known as Sodium Salt of 4-Nitrophenol, NaPNP, or sodium salt of para nitrophenol is derived from 4-nitrophenol, belonging to the phenol family. It consists of a sodium ion (Na+) attached to the 4-nitrophenolate molecule, along with two water molecules (H2O) as hydrates. The chemical formula of sodium 4-nitrophenolate dihydrate is C6H4NO3Na·2H2O. This compound exhibits properties derived from 4-nitrophenol, sodium, and water. It appears as bright yellow to light brown crystals and is highly soluble in water. Sodium 4-nitrophenolate dihydrate possesses both the phenolic and ionic characteristics, combining the reactivity of the phenolate group (-O^-) with the stabilizing effects of the sodium ion. The presence of water molecules in the crystal structure contributes to its physical properties, such as solubility and stability.


Synthesis Methods

Sodium 4-nitrophenolate dihydrate can be synthesized through various methods. One common approach involves the reaction between 4-nitrophenol and sodium hydroxide (NaOH) in an aqueous medium, followed by the addition of water to form the dihydrate. This reaction results in the displacement of the hydrogen atom from the hydroxyl group by the sodium ion, forming sodium 4-nitrophenolate. The addition of water molecules leads to the formation of the dihydrate form. The reaction is typically carried out under controlled conditions, and the formation of the dihydrate can be confirmed through various analytical techniques.


Sodium 4-nitrophenolate dihydrate serves as a crucial building block in organic synthesis. Its reactivity and versatility make it a valuable intermediate in the production of pharmaceuticals, dyes, and agrochemicals. The phenolate group in sodium 4-nitrophenolate dihydrate enables various substitution reactions, allowing for the introduction of different functional groups. This compound is particularly useful in the synthesis of nitro-substituted aromatic compounds, which find applications in pharmaceutical drug development and the production of agrochemicals.

Sodium 4-nitrophenolate dihydrate is recognized as an effective plant growth regulator and elicitor. When applied to crops, it stimulates growth, enhances plant defence mechanisms, and improves overall yield. Sodium 4-nitrophenolate dihydrate acts as a signalling molecule, activating various physiological processes such as seed germination, root development, and flowering. It promotes nutrient uptake and photosynthetic activity in plants, contributing to improved crop health and increased productivity. It also referred to the 'Yellow Mix' in the local domestic markets.

Sodium 4-nitrophenolate dihydrate exhibits excellent corrosion inhibition properties. It can be used to protect metal surfaces from corrosion caused by exposure to aggressive environments. By forming a protective film on the metal surface, sodium 4-nitrophenolate dihydrate inhibits the electrochemical reactions that lead to corrosion. This compound finds applications in various industries, including automotive, aerospace, and infrastructure, where protection against corrosion is critical for extending the lifespan of structures and equipment.

Sodium 4-nitrophenolate dihydrate is employed in the synthesis of dyes and pigments. Its reactivity and solubility make it suitable for various colorant applications. The compound allows for the introduction of additional functional groups, enabling the production of vibrant and stable colorants used in textiles, inks, coatings, and other industries.

Sodium 4-nitrophenolate dihydrate is used as a reagent in analytical chemistry techniques. It serves as a chelating agent for the determination of metal ions through complexometric titrations. Sodium 4-nitrophenolate dihydrate forms stable complexes with certain metal ions, allowing for their quantitative analysis in samples.

Sodium 4-nitrophenolate dihydrate, derived from 4-nitrophenol, is a versatile compound with diverse applications. Its significance in organic synthesis, agriculture, corrosion inhibition, dye production, and analytical chemistry highlights its versatility and potential. By harnessing the unique properties of sodium 4-nitrophenolate dihydrate, we can continue to explore its applications and contribute to advancements in various industries.



The product is packed in HDPE woven bags with Net Weight of 50 kg and LDPE Liner inside for added protection. Also available in Fibre Drums with Net Weight of 25 kgs (Charges Extra)

The product can be packed in UN Approved bags / UN Approved HDPE Drums with Net Weight of 25 kg additional LDPE Liner inside for added protection.