2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene: properties, applications and safety

General Description

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is a yellow-green powder and has limited solubility in water but dissolves well in various organic solvents. This compound is widely used as a fluorescent whitening agent and optical brightener in industries such as plastics, textiles, coatings, adhesives, detergents, and inks. Its unique properties, including high light stability and strong fluorescence in the ultraviolet region, make it valuable for enhancing the visual appearance of products. In addition to its application as a color enhancer, it has been studied for its potential as a fluorescent material in optoelectronic devices. However, safety precautions must be taken when handling this compound to avoid inhalation, skin and eye contact, and exposure to potentially harmful fumes.

Figure 1. 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

Properties

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is a yellow-green powder with a melting point of 200-201°C and a decomposition temperature greater than 220°C. It is difficultly soluble in water but soluble in alkanes, fats, mineral oils, waxes, and common organic solvents. The maximum absorption wavelength is 374nm. 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is a widely used fluorescent whitening agent and optical brightener. It exhibits excellent light stability and has a strong fluorescence effect in the ultraviolet region. Due to its unique properties, it is commonly used in various applications such as plastics, fibers, coatings, adhesives, and detergents. In the plastics industry, this compound is added to polymer materials to enhance their whiteness and brightness, resulting in improved visual appearance and increased value. It is also used in the textile industry to improve the whiteness of fabrics, making them appear brighter and more appealing. Furthermore, 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is utilized in the formulation of coatings and paints to improve their brightness and color stability. It is also employed as a fluorescent marker in inks, ensuring the printed materials have a vibrant and attractive appearance. Overall, this compound's properties, including its solubility, melting point, and fluorescence effect, make it a valuable additive in various industries, contributing to the enhancement of product aesthetics and visual appeal. ¹

Applications

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene has been utilized as a high concentration fluorescent dopant in thin nano-porous silica films through a sol-gel process. The resulting hybrid films exhibit uniform and bright blue fluorescence, with photoluminescence intensity increasing linearly with 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene concentration. Optical microscopy showed no molecular aggregation or phase separation at concentrations below 6 x 10(-3) mol x L(-1). Surprisingly, fluorescence lifetimes of 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene in the silica films were longer than in dilute dioxane solution, and varied with gelation conditions. The absence of concentration quenching in 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene -doped silica matrices was attributed to the suppression of molecular interactions by the nano-porous structure. This study demonstrates the stability and effectiveness of 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene -doped silica hybrid materials as a viable option for fluorescent material applications. The unique properties observed in these materials may open new avenues in the development of highly efficient optoelectronic devices, such as sensors and displays, that require stable and long-lasting fluorescence emission. ²

Safety

When handling 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene, it is important to prioritize safety measures to prevent any potential risks. Firstly, it is advised to avoid the formation of dust particles, as inhalation of dust may be harmful. Additionally, it is necessary to avoid breathing in any mist, gas, or vapors that may be released during the handling or processing of this compound. To ensure personal safety, it is crucial to avoid direct contact with the skin and eyes. It is recommended to use personal protective equipment (PPE) such as gloves and goggles to minimize the risk of exposure. Specifically, chemical impermeable gloves are recommended when handling this compound. Furthermore, it is vital to work in a well-ventilated area to maintain adequate air circulation and reduce the concentration of any potentially hazardous fumes. This can be achieved by working near an exhaust system or ensuring sufficient natural ventilation. Lastly, all possible sources of ignition should be removed from the vicinity to prevent fires or explosions. This includes open flames, sparks, and hot surfaces. By following these safety guidelines and taking necessary precautions, the risks associated with handling 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene can be minimized, ensuring the safety and well-being of individuals involved in its handling and processing. ³

Reference

1. PubChem. COMPOUND SUMMARY: 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene. National Library of Medicine, 2005, CID: 292429.

2. Wang JL, He ZQ, Wang YS, Mu LP, Ye S, Jing XP. Photoluminescence from bis-t-butylbenzoxazolylthiophene doped silica films. Guang Pu Xue Yu Guang Pu Fen Xi, 2009, 29(7): 1740-1744.

3. 2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole). European Chemicals Agency, EC / List no. 230-426-4.

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