Description

4-Hydroxy-5-[[(2-Hydroxy-1-Naphthalenyl)Methylene]Amino]-2,7-Naphthalenedisulfonic Acid is a high-purity, functionalized naphthalene derivative that serves as a critical intermediate and analytical reagent. Its value lies in its unique molecular structure, which combines a chelating Schiff base moiety with strongly acidic sulfonic groups, making it highly effective for metal ion complexation and detection. This compound is essential for manufacturers and research laboratories in the chemical synthesis, analytical chemistry, and specialty dye industries.

Application

• Analytical Reagent: Used as a sensitive colorimetric and spectrophotometric reagent for the detection and quantification of metal ions, particularly aluminum, iron, and other transition metals.
• Chemical Synthesis Intermediate: Serves as a key building block for synthesizing more complex organic molecules, dyes, and functional materials.
• Chelating Agent: Employed in formulations and processes requiring selective metal ion binding, such as in water treatment or catalysis research.
• Dye and Pigment Manufacturing: Acts as a precursor or intermediate in the production of specific azo dyes and pigments due to its naphthalene backbone and functional groups.
• Research & Development: Utilized in academic and industrial R&D for studying coordination chemistry, sensor development, and material science applications.
• Photographic Chemicals: Can be used in the formulation of certain specialty photographic chemicals and sensitizers.

Basic Information

Item	Details
Product Name	4-Hydroxy-5-[[(2-Hydroxy-1-Naphthalenyl)Methylene]Amino]-2,7-Naphthalenedisulfonic Acid
CAS No.	94787-53-8
Molecular Formula	C21H15NO8S2
Molecular Weight	473.48 g/mol
Synonyms	5-[[(2-Hydroxy-1-naphthyl)methylene]amino]-4-hydroxy-2,7-naphthalenedisulfonic acid; 4-Hydroxy-5-[(2-hydroxy-1-naphthylmethylene)amino]-2,7-naphthalenedisulfonic acid; HNA-NDSA; Aluminon related compound; Aurintricarboxylic acid analog; Schiff base naphthalenedisulfonate; Metal indicator dye; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[[(2-hydroxy-1-naphthalenyl)methylene]amino]-
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-5-[[(2-Hydroxy-1-Naphthalenyl)Methylene]Amino]-2,7-Naphthalenedisulfonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via FT-IR and NMR, to ensure it meets precise customer specifications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as strong acids and organic solvents.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water, alkaline solutions; slightly soluble in most organic solvents

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.