Description

4,4'-Bis[2,6-Di(2-Naphthoxy)Pyrimidin-4-Ylamino] Stilbene-2,2'-Disulfonic Acid is a high-purity, complex organic compound primarily valued as a key intermediate in the synthesis of advanced fluorescent whitening agents (FWAs) and optical brighteners. Its molecular structure is engineered to absorb ultraviolet light and re-emit it as visible blue light, a property critical for enhancing the brightness and whiteness of materials. This product is essential for manufacturers in the plastics, textiles, paper, and detergent industries seeking to improve the aesthetic appeal and perceived quality of their finished products.

Application

• Optical Brightener Intermediate: A critical precursor in the synthesis of high-performance stilbene-based fluorescent whitening agents for industrial applications.
• Plastics and Polymers: Used to manufacture masterbatches and compounds that impart a bright, white appearance to engineering plastics, films, and fibers.
• Textile Finishing: Incorporated into formulations for finishing agents to achieve superior whiteness and brightness in synthetic and blended fabrics.
• Paper Coating and Pulp: Applied in coatings and treatments for high-quality paper products, including photographic paper and premium packaging, to enhance optical properties.
• Detergent and Laundry Care: Serves as a building block for brighteners used in laundry detergents and fabric softeners to make white clothes appear cleaner and brighter.
• Advanced Material Research: Utilized in R&D for developing novel photoluminescent materials, sensors, or organic electronic components due to its conjugated structure.

Basic Information

Item	Details
Product Name	4,4'-Bis[2,6-Di(2-Naphthoxy)Pyrimidin-4-Ylamino] Stilbene-2,2'-Disulfonic Acid
CAS No.	28837-52-7
Molecular Formula	C62H42N6O10S2
Molecular Weight	1071.15 g/mol
Synonyms	4,4'-Bis[2,6-bis(2-naphthyloxy)pyrimidin-4-ylamino]stilbene-2,2'-disulfonic acid; Fluorescent Brightener Intermediate; Optical Brightener 28837-52-7; Stilbene disulfonic acid derivative; FWA Intermediate; 2,2'-Stilbenedisulfonic acid, 4,4'-bis[2,6-bis(2-naphthalenyloxy)-4-pyrimidinyl]amino]-; Brightener 28837-52-7
EINECS	Contact for details

Quality Control

Our production of 4,4'-Bis[2,6-Di(2-Naphthoxy)Pyrimidin-4-Ylamino] Stilbene-2,2'-Disulfonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling, to meet precise customer specifications. Certificates of Analysis (COA) documenting identity, purity, and related substances are provided with every shipment.

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 tightly sealed after opening to prevent degradation from atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 2.0%
Related Substances (HPLC)	Total impurities ≤ 5.0%
Solubility	Soluble in alkaline aqueous solutions

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