2918-83-4

Basic information

• Product Name: 4'-hydroxyazobenzene-4-sulphonic acid
• Synonyms: 4'-hydroxyazobenzene-4-sulphonic acid;4-(4-Hydroxyphenylazo)benzenesulfonic acid;4-[(4-Sulfophenyl)diazenyl]phenol;4-Hydroxy-4'-sulfoazobenzene
• CAS NO: 2918-83-4
• Molecular Formula: C₁₂H₁₀N₂O₄S
• Molecular Weight: 278.2838
• EINECS: 220-856-0
• Mol File: 2918-83-4.mol
• Article Data: 7

Chemical Properties

• Melting Point: 270-275 °C
• Boiling Point: °Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: 1.44g/cm³
• PKA: -1.03±0.50(Predicted)
• CAS DataBase Reference: 4'-hydroxyazobenzene-4-sulphonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 4'-hydroxyazobenzene-4-sulphonic acid(2918-83-4)
• EPA Substance Registry System: 4'-hydroxyazobenzene-4-sulphonic acid(2918-83-4)

Safety Data

• Hazardous Substances Data: 2918-83-4(Hazardous Substances Data)

Usage

General Description

4'-hydroxyazobenzene-4-sulphonic acid is a chemical compound with the molecular formula C12H10N2O5S. It is a synthetic dye that is commonly used in the textile and paper industries. 4'-hydroxyazobenzene-4-sulphonic acid is an azo dye, which means it contains a specific functional group known as an azo group. 4'-hydroxyazobenzene-4-sulphonic acid is characterized by its deep red-orange color and is often used to dye fabrics, paper, and leather. Additionally, it is also used as a pH indicator in laboratory experiments due to its color-changing properties in different pH environments. However, there is increasing concern about the environmental and health impacts of azo dyes, including 4'-hydroxyazobenzene-4-sulphonic acid, as they have been found to release toxic aromatic amines when they degrade, leading to regulations on their use and disposal in many countries.

Upstream product

• 495-48-7 azoxybenzene 
• 104-23-4 4'-aminoazobenzene-4-sulfonic acid 
• 305-80-6 4-diazobenzenesulfonic acid 
• 99-96-7 4-hydroxy-benzoic acid 
• 7664-93-9 sulfuric acid 
• 1689-82-3 4-hydroxyazobenzene 
• 2154-66-7 4-sulfobenzenediazonium 
• 108-95-2 phenol 
• 2484-88-0 4-phenylazo-benzenesulfonic acid 
• 121-57-3 4-aminobenzene sulfonic acid 
• 6118-33-8 p-sulfobenzenediazonium chloride 
• 69-72-7 salicylic acid 
• 7732-18-5 water 
• 65036-56-8 4-(4-sulfo-phenylazo)-benzenediazonium-betaine 

Downstream Products

• 2835-04-3 5-amino-2-hydroxybenzenesulfonic acid 
• 67329-17-3 2-nitro-4-(4'-sulfophenylazo)-phenol 
• 2050-16-0 4,4'-dihydroxyazobenzene 
• 305-80-6 4-diazobenzenesulfonic acid 
• 118-75-2 chloranil 
• 98-67-9 p-hydoroxybenzenesulfonic acid 
• 118-79-6 2,4,6-tribromophenol 
• 123-30-8 4-amino-phenol 
• 121-57-3 4-aminobenzene sulfonic acid 
• 10521-17-2 4-(4-methoxy-phenylazo)-benzenesulfonic acid 

Relevant articles and documents

Manipulating assembly of cationic dipeptides using sulfonic azobenzenes

Three sulfonic azobenzenes with tiny differences in the terminal were used to manipulate the assembly of cationic dipeptides (CDP); assemblies with diverse morphologies including urchin-like, flower-like and plate-like structures were formed.

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An environmentally friendly, photocontrollable and highly recyclable catalyst for use in a one-pot three-component Mannich reaction

An environmentally friendly, photocontrollable and highly recyclable catalyst (ZrOPPAZOSO3H) has been synthesized by the immobilization of 4-[4-(6-phosphonic acid-hexanoxyl)phenylazo]benzenesulfonic acid onto zirconium phosphonate. This catalyst was characterized by Fourier transform infrared, scanning electron microscopy, X-ray powder diffraction, nitrogen adsorption-desorption and UV-vis analyses. The catalytic activity of ZrOPPAZOSO3H was investigated towards the one-pot three-component Mannich-type reaction of benzaldehyde, aniline and cyclohexanone in water at room temperature, and gave excellent yields. Interestingly, the catalytic activity could be regulated by photoirradiation. Furthermore, upon completion of the reaction, the product could be readily separated by extraction, and the water phase reused in the next run. Lastly, the catalyst could be readily recovered by centrifugation and reused up to six times without any discernible impact on its activity.