Fluorescent Brightener 351
[CAS# 38775-22-3]

Identification

• Classification: Catalysts and additives >> Fluorescent whitening agent
• Name: Fluorescent Brightener 351
• Synonyms: 2,2'-([1,1'-Biphenyl]-4,4'-diyldi-2,1-ethenediyl)bis-benzenesulfonic acid; 4,4'-Bis[2-(2-sulfophenyl)ethenyl]biphenyl; C.I. 482200; CBS (fluorescent brightener)
• Molecular Formula: C₂₈H₂₂O₆S₂
• Molecular Weight: 518.60
• CAS Registry Number: 38775-22-3 (54351-85-8)
• EC Number: 254-121-0
• SMILES: C1=CC=C(C(=C1)/C=C/C2=CC=C(C=C2)C3=CC=C(C=C3)/C=C/C4=CC=CC=C4S(=O)(=O)O)S(=O)(=O)O

Properties

• Density: 1.4±0.1 g/cm³, Calc.^*, 1.414 g/cm³
• Index of Refraction: 1.688, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H302-H315-H319-H335
• Safety Statements: P261-P264-P270-P271-P280-P301+P312-P302+P352-P304+P340-P305+P351+P338-P330-P332+P313-P337+P313-P362-P403+P233-P405-P501

Discovery and Applications

Fluorescent Brightener 351 is a chemical compound widely used as a fluorescent whitening agent in various industrial applications. This substance, part of the broader category of optical brighteners, is valued for its ability to enhance the brightness and whiteness of materials by absorbing UV light and re-emitting it as visible blue light.

The discovery of Fluorescent Brightener 351 arose from the ongoing search for effective optical brighteners that could improve the appearance and performance of consumer and industrial products. Its development was driven by the need for materials that could maintain their aesthetic quality over time, particularly in the textile and paper industries where whiteness and brightness are crucial.

Fluorescent Brightener 351 is primarily utilized in the textile industry, where it is incorporated into fabrics and fibers to enhance their whiteness. By absorbing UV light, the brightener emits blue light, counteracting any yellowish hues in the fabric and making it appear brighter and more vibrant. This effect is particularly beneficial in the production of white or light-colored textiles, where maintaining a true white appearance is important for both aesthetic and functional reasons.

In addition to textiles, Fluorescent Brightener 351 is extensively used in the paper industry. When added to paper products, it improves the brightness and whiteness of the paper, making it more visually appealing. This is especially important for high-quality printing papers and packaging materials where a bright, clean appearance is desired.

The compound also finds application in detergents and cleaning products. When included in these formulations, Fluorescent Brightener 351 helps to maintain the brightness of fabrics and other surfaces by counteracting the yellowing that can occur over time. This role is critical in ensuring that textiles and other materials retain their appearance after repeated washing or cleaning.

The effectiveness of Fluorescent Brightener 351 has been well-documented in scientific research. Studies have shown that it significantly improves the brightness and whiteness of materials, which enhances their overall quality and appeal. The brightener's ability to absorb UV light and re-emit it as visible light is a key factor in its performance, making it a valuable additive in various industries.

Fluorescent Brightener 351 is generally applied in low concentrations, making it a cost-effective solution for improving the visual properties of products. Its incorporation into textiles, paper, and cleaning products is straightforward, and it is compatible with a wide range of other ingredients commonly used in these applications.

In summary, Fluorescent Brightener 351 is a valuable chemical compound used to enhance the brightness and whiteness of textiles, paper, and cleaning products. Its ability to absorb UV light and re-emit it as visible blue light makes it an essential component in maintaining the visual appeal of a variety of materials.

References

2008. Interaction of stilbene compounds with human and rainbow trout estrogen receptors. Environmental Toxicology and Chemistry.
DOI: 10.1897/07-146r.1

2014. Determination of Tinopal CBS-X in rice papers and rice noodles using HPLC with fluorescence detection and LC-MS/MS. Food Additives & Contaminants: Part A.
DOI: 10.1080/19440049.2014.934302