Acid Brown 4

• CAS: 5858-51-5
• Catalog Number: ACM5858515
• Category: Acid Dyes
• Molecular Weight: 365.33
• Molecular Formula: C16H12N3O4SNa
• Description: Acid Brown 4 is a widely used chemical reagent in laboratory experiments. It has been used for many years in biochemical, physiological, and medical research.
• Synonyms: Acid Brown 4;Acid brown 4 (C.I. 14805)
• IUPAC Name: sodium;6-[(4-aminophenyl)diazenyl]-5-hydroxynaphthalene-1-sulfonate
• Canonical SMILES: C1=CC2=C(C=CC(=C2O)N=NC3=CC=C(C=C3)N)C(=C1)S(=O)(=O)[O-].[Na+]
• InChI: InChI=1S/C16H13N3O4S.Na/c17-10-4-6-11(7-5-10)18-19-14-9-8-12-13(16(14)20)2-1-3-15(12)24(21,22)23;/h1-9,20H,17H2,(H,21,22,23);/q;+1/p-1
• InChI Key: VFYDFVDOOIPQHX-UHFFFAOYSA-M
• Solubility: Soluble in water, ethanol and concentrated sulfuric acid.
• Appearance: Powder
• Application: Acid Brown 4 is used in a variety of scientific research applications. It is used as an enzyme inhibitor, a fluorescent probe, a chromogenic reagent, and a fluorescent label. It has also been used in immunological assays, in the study of protein-protein interactions, and in the study of DNA-protein interactions.
• Storage: Room temperature
• EC Number: 227-492-1
• Exact Mass: 365.045
• Features And Benefits: Soluble in water for red light brown, soluble in ethanol for yellow light brown. The strong sulfuric acid for wine red, dark blue, diluted to the red-orange. Strong hydrochloric acid solution to join a brown orange precipitation; Add thick sodium hydroxide solution for palm orange.
• PSA: 136.55
• XLogP3: 5.1091

Case Study

Diazotization-Coupling Dyeing Process of Silk Fabrics with Acid Brown 4

Jiang Hua, et al. Journal of Textile Science, 2019, 40(11), 100-105.

Acid brown 4 is a representative aromatic primary amine dye that can be used for coupling dyeing of silk fabrics after diazotization. In the process of dyeing silk fabrics with acid brown 4, the formation of azo bonds expands the π conjugated system of the dye color body and reduces the energy level band gap between the highest occupied orbital and the lowest unoccupied orbital (HOMO-LOMO) of the dye molecule.
Dyeing method by acid brown 4
· First, the acid brown 4 dye and silk fabric were heated in the same bath at 80°C for 30 minutes in a Yuanming powder aqueous solution with a pH value of 5 and a mass concentration of 8g/L.
· Then the temperature was lowered to 0°C and the diazotization reaction was carried out for 10 minutes.
· Finally, sodium carbonate solution was used to adjust the pH value to 8~9 and the reaction was carried out for 30 minutes.
· The color fastness to soaping and rubbing of silk fabrics dyed with acid brown 4 can reach level 4 or above.