Fluorescent Brightener 184
[CAS# 7128-64-5]

Identification

• Classification: Catalysts and additives >> Fluorescent whitening agent
• Name: Fluorescent Brightener 184
• Synonyms: 2,5-Bis(5'-tert-butyl-2-benzoxazol-2-yl)thiophene; 2,5-Di(5-tert-butylbenzoxazol-2-yl)thiophene; BBOT
• Molecular Formula: C₂₆H₂₆N₂O₂S
• Molecular Weight: 430.56
• CAS Registry Number: 7128-64-5 (12224-40-7)
• EC Number: 230-426-4
• SMILES: CC(C)(C)C1=CC2=C(C=C1)OC(=N2)C3=CC=C(S3)C4=NC5=C(O4)C=CC(=C5)C(C)(C)C

Properties

• Density: 1.26
• Melting point: 196-202 °C

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
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411

Discovery and Applications

Fluorescent Brightener 184, also known as 1,2-bis(4-(3-(4-(dimethylamino)phenyl)-1,2,3,4-tetrahydroquinolin-6-yl)phenyl)ethane), is a synthetic organic compound widely used as a fluorescent whitening agent. Its discovery and application span various industries, where it plays a crucial role in enhancing the appearance and functionality of products.

The discovery of Fluorescent Brightener 184 was part of the ongoing research into optical brighteners and their applications. Optical brighteners are compounds that absorb ultraviolet (UV) light and re-emit it as visible blue light, making materials appear whiter and brighter. This discovery arose from the need to develop more effective and stable brighteners for use in textiles, paper, and other materials where enhanced whiteness is desirable.

Fluorescent Brightener 184 was developed to improve the brightness and color quality of various substrates. Its chemical structure features a central ethane bridge connecting two phenyl rings, each substituted with a dimethylamino group and a tetrahydroquinoline moiety. This structure contributes to its effective fluorescence and stability under UV light. The compound's effectiveness is attributed to its ability to absorb UV light and emit blue fluorescence, which counteracts yellowish tones and enhances the perceived whiteness of materials.

The primary application of Fluorescent Brightener 184 is in the textile industry, where it is used to improve the brightness of fabrics. When added to detergents or directly applied to textiles, the brightener enhances the whiteness of clothing and other fabrics. This effect is particularly valuable for maintaining the appearance of white and light-colored textiles, which can become discolored or dull over time. The compound's ability to maintain fabric brightness even after multiple washes makes it a popular choice for textile manufacturers.

In addition to textiles, Fluorescent Brightener 184 is also used in the paper industry. It is incorporated into paper coatings and adhesives to improve the brightness and visual appeal of paper products. By enhancing the whiteness of paper, the brightener contributes to the overall quality and marketability of printed materials, including books, magazines, and packaging.

Another significant application of Fluorescent Brightener 184 is in the production of plastics. The compound is used in various plastic products, including films, containers, and household items, to enhance their whiteness and brightness. This application is crucial for maintaining the aesthetic quality of plastic products and ensuring they meet industry standards for appearance.

The brightener's stability and effectiveness have also made it a subject of interest in research related to fluorescence and optical properties. Studies have focused on optimizing its performance and exploring its potential in new applications, including advanced materials and coatings.

In summary, Fluorescent Brightener 184 is a versatile and effective compound used to enhance the whiteness and brightness of textiles, paper, and plastics. Its discovery and development have significantly impacted industries requiring high-quality visual appearance, contributing to the aesthetics and functionality of a wide range of products.

References

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DOI: 10.5281/zenodo.5794106

2024. Emergent mechanical properties in highly filled additively manufactured polymer composites. MRS Communications, 14(2).
DOI: 10.1557/s43579-024-00530-x

2024. Evidence for widespread human exposure to food contact chemicals. Journal of Exposure Science & Environmental Epidemiology, 34(5).
DOI: 10.1038/s41370-024-00718-2