Pyrromethene 546(CAS: 121207-31-6)

Pyrromethene 546 is a red fluorescent dye with a high molar absorptivity and quantum yield. It has a molecular weight of approximately 392.35 g/mol. This compound is soluble in organic solvents such as ethanol, acetone, and dichloromethane but less so in water. It exhibits excellent photostability and high fluorescence intensity, making it suitable for bioimaging and other applications requiring bright fluorescence.

Pyrromethene 546 is synthesized through a multistep process involving the cyclization of 2,5-diphenyloxazole with an acrylonitrile derivative. The reaction typically uses a Lewis acid catalyst such as aluminum trichloride. The process involves the formation of an intermediate nitrile, followed by cyclization to form the pyrromethene ring. The overall yield is moderate to good, and the reaction conditions are carefully controlled to achieve high selectivity.

Pyrromethene 546 is widely used in various industries. It is employed in the pharmaceutical sector for drug delivery systems and fluorescence labeling. In the polymer industry, it serves as a fluorescent marker. It is also used in sensor technologies for detecting various analytes. Additionally, Pyrromethene 546 is applied in semiconductor manufacturing for quantum dot applications and in organic light-emitting diodes (OLEDs).

When handling Pyrromethene 546, it is essential to use personal protective equipment (PPE) such as gloves, goggles, and a lab coat. Work should be conducted in a well-ventilated area or a fume hood to minimize inhalation of vapors. Spills should be cleaned up promptly using appropriate absorbent materials, and the area should be thoroughly rinsed. Safety data sheets (SDS) should be consulted for detailed handling and emergency procedures. Storage should be in a cool, dry place away from direct sunlight and heat sources.