Fluorescent Brightener 367
[CAS# 5089-22-5]

Identification

• Classification: Catalysts and additives >> Fluorescent whitening agent
• Name: Fluorescent Brightener 367
• Synonyms: 2,2-(1,4-Naphthalenediyl)bis-benzoxazole; 2,2'-(Naphthalene-1,4-diyl)bis(benzoxazole); 1,4-Bis(benzoxazolyl-2-yl)naphthalene; 1,4-Bis(2-benzoxazolyl)napthalene; Hostalux KCB
• Molecular Formula: C₂₄H₁₄N₂O₂
• Molecular Weight: 362.39
• CAS Registry Number: 5089-22-5 (63310-10-1)
• EC Number: 225-803-5
• SMILES: C1=CC=C2C(=C1)C(=CC=C2C3=NC4=CC=CC=C4O3)C5=NC6=CC=CC=C6O5

Properties

• Melting point: 210-212 °C
• Water solubility: insoluble

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H413
• Safety Statements: P273-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413

Discovery and Applications

Fluorescent Brightener 367, also known as 4,4'-Bis(2-sulfostyryl)biphenyl, is a synthetic organic compound renowned for its vivid fluorescent properties. This substance belongs to the class of optical brighteners or fluorescent whitening agents, which are widely used to enhance the brightness and whiteness of materials.

The discovery of Fluorescent Brightener 367 dates back to the late 20th century, as researchers sought to develop more effective compounds for enhancing the optical properties of textiles, papers, and plastics. The compound's structure, characterized by the presence of two styryl groups attached to a biphenyl backbone, allows it to absorb ultraviolet light and emit visible blue fluorescence. This characteristic makes it highly effective in masking the yellowish tinge often found in materials over time, thereby improving their appearance.

Fluorescent Brightener 367 is particularly valued in the textile industry, where it is used in laundry detergents and fabric conditioners. The brightener is incorporated into these products to counteract the yellowing of fabrics and maintain a crisp, clean appearance. By absorbing UV light and re-emitting it as visible blue light, Fluorescent Brightener 367 enhances the whiteness of textiles and helps to preserve their aesthetic quality. This application is critical in maintaining the appearance of clothing and home textiles, contributing to consumer satisfaction and product longevity.

In addition to its use in textiles, Fluorescent Brightener 367 is employed in the paper industry. It is added to paper coatings and printing inks to improve the brightness and whiteness of paper products. The brightener’s ability to enhance the reflectance of visible light ensures that printed materials appear more vibrant and clear. This application is especially important for high-quality printing, where visual impact and color fidelity are paramount.

Another significant application of Fluorescent Brightener 367 is in the field of plastics. It is used as an additive in plastic formulations to achieve a bright, white appearance and enhance the visual appeal of plastic products. The brightener helps to offset any yellowing or discoloration that may occur in plastic materials over time, ensuring that products maintain their desired appearance throughout their lifespan.

Furthermore, Fluorescent Brightener 367 finds use in various other industries, including detergents and personal care products. Its ability to enhance the brightness of products and maintain a clean, fresh appearance makes it a valuable ingredient in a range of applications. The brightener is incorporated into products such as shampoos and soaps to improve their visual appeal and overall consumer experience.

Overall, Fluorescent Brightener 367 is a versatile and effective compound that plays a crucial role in enhancing the brightness and whiteness of textiles, paper, and plastics. Its unique fluorescence properties contribute to maintaining the aesthetic quality of various materials, making it an important component in numerous industrial and consumer applications.

References

2024. Multifunctional elastic benzoxazole derivative crystals for advanced optoelectronic applications. Science China Materials, 67(11).
DOI: 10.1007/s40843-024-3140-4