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4'-Aminoazobenzene-4-sulfonic acid

Also known as: 4-Aminoazobenzene-4'-sulfonic acid, 4-[(4-Aminophenyl)azo]benzenesulfonic acid, p-(p-Aminophenylazo)benzenesulfonic acid, Benzenesulfonic acid, 4-[(4-aminophenyl)azo]-, P-AMINOAZOBENZENE-4'-SULFONIC ACID, PARA AMINOAZOBENZENE-4-SULFONIC ACID (PAAB4SA)

4'-Aminoazobenzene-4-sulfonic acid (CAS 104-23-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C12H11N3O3S and a molecular weight of 277.30300 g/mol. Key properties include a melting point of 125-131 °C and a density of 1.43 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.

CAS No.
104-23-4
Jingsj CID
J-26912-5
Molecular Formula
C12H11N3O3S
Molecular Weight
277.30300 g/mol
Category
Organic Acids
Last updated
11/2/2026
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Physicochemical Properties

Melting Point125-131 °C
Density1.43 g/cm3
Exact Mass299.034058
PSA116.32000
LogP4.25030
Refractive Index1.663

Customs & Trade Information

HS Code2927000090
Summary2927000090 other diazo-, azo- or azoxy-compounds。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4'-Aminoazobenzene-4-sulfonic acid?

The CAS number of 4'-Aminoazobenzene-4-sulfonic acid is 104-23-4.

What are the molecular formula and molecular weight of 4'-Aminoazobenzene-4-sulfonic acid?

4'-Aminoazobenzene-4-sulfonic acid has molecular formula C12H11N3O3S and molecular weight 277.30300 g/mol.

What are the upstream and downstream products of 4'-Aminoazobenzene-4-sulfonic acid?

For 4'-Aminoazobenzene-4-sulfonic acid, Upstream Products: 4-Aminoazobenzene hydrochloride, p-Diazobenzenesulfonic acid, p-Toluenesulfonanilide; Downstream Products: Methyl Orange, p-Phenylenediamine, Sulfanilic acid.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "4'-Aminoazobenzene-4-sulfonic acid (CAS 104-23-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26912-5 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.