Phloxine B(CAS: 18472-87-2)

Phloxine B is a red azo dye with a molecular weight of approximately 300 g/mol. It is slightly soluble in water and has good light stability. Chemically, it is stable under normal conditions but can react with strong reducing agents. Phloxine B is often used in acidic solutions and has a pKa of about 6.5.

Phloxine B is synthesized through the coupling of an aromatic diazonium salt with an azoic aniline. The reaction typically requires a coupling catalyst such as sodium hydroxide and occurs in an aqueous or organic medium. The yield is generally high, around 80-90%, and the process is selective, making it a popular method for dye synthesis.

Phloxine B is widely used in the textile and dyeing industry for coloring fabrics. It is also employed in pharmaceuticals for coloring medications, in food and cosmetics for coloring purposes, and in the paper industry to enhance the appearance of paper. Additionally, it has applications in the analytical chemistry field for dye-sensitized solar cells and other sensing devices.

When handling Phloxine B, proper personal protective equipment (PPE) should be worn, including gloves, goggles, and a lab coat. The substance should be used in a well-ventilated area or a fume hood to minimize inhalation risks. Spills should be cleaned up with caution, using appropriate absorbent materials, and the area should be well-ventilated. Always consult the Safety Data Sheet (SDS) for detailed handling and disposal information.