Description

4-Nitro-4'-Aminostilbene-2,2'-Disulfonic Acid is a high-purity, water-soluble organic intermediate characterized by its distinct stilbene backbone with nitro and amino functional groups. This compound matters as a critical precursor in the synthesis of optical brighteners and fluorescent dyes, where its specific structure enables excellent light-absorbing and energy-transfer properties. It is primarily needed by manufacturers in the textile, paper, detergent, and specialty chemical industries for producing high-performance additives that enhance whiteness and brightness.

Application

• Optical Brightening Agent (OBA) Synthesis: A key intermediate for manufacturing stilbene-type fluorescent whitening agents used in detergents and paper.
• Textile Auxiliary Production: Used in creating brighteners and finishing agents for cotton, nylon, and other synthetic fibers to improve visual appeal.
• Paper Brightening: Serves as a building block for chemicals applied in high-quality paper manufacturing to achieve superior whiteness.
• Dye and Pigment Intermediate: Employed in the synthesis of specific disperse dyes and other colorants requiring a sulfonated stilbene structure.
• Research & Development: Utilized in chemical research for developing new fluorescent markers, sensors, and advanced organic materials.
• Polymer Additives: Can be incorporated into polymer matrices to impart specific optical or functional properties.

Basic Information

Product Name	4-Nitro-4'-Aminostilbene-2,2'-Disulfonic Acid
CAS No.	119-72-2
Molecular Formula	C₁₄H₁₂N₂O₈S₂
Molecular Weight	400.38 g/mol
Synonyms	4-Nitro-4'-aminostilbene-2,2'-disulfonic acid; 2,2'-(4-Nitro-4'-aminostilbene)disulfonic acid; 4-Amino-4'-nitrostilbene-2,2'-disulfonic acid; 4,4'-Diaminostilbene-2,2'-disulfonic acid, 4'-nitro-; Stilbene-2,2'-disulfonic acid, 4-amino-4'-nitro-; 4-Amino-4'-nitro-2,2'-stilbenedisulfonic acid; Fluorescent Brightener Intermediate; OBA Intermediate
EINECS	204-347-1

Quality Control

Our 4-Nitro-4'-Aminostilbene-2,2'-Disulfonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for use in sensitive synthesis processes. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and strong bases. The product is moisture-sensitive; ensure the container is sealed after each use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to brownish-yellow powder or crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%
Solubility (in water)	Freely soluble

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