Solvent Yellow 7
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||198.225 g·mol−1|
|Appearance||An orange solid|
|Melting point||155 °C (311 °F; 428 K)|
|Slightly soluble in hot water|
|Solubility in other solvents||Soluble in ethanol, acetone|
|Acidity (pKa)||8.2 (from the hydroxyl group)|
|Occupational safety and health (OHS/OSH):|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Solvent Yellow 7 is a common azo dye with a formula of C6H5N2C6H4OH.
Like most azobenzenes, Solvent Yellow 7 can be synthesized by the reaction of phenyldiazonium salt with phenol. The optimal pH value for this azo coupling is 8.5-10. The reaction is carried out in water, since sodium chloride (or potassium chloride) formed in the reaction is soluble in water, while the product precipitates.