3624-68-8 Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate 1-Naphthalenesulfonic acid, 6-(2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2) 1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt EINECS 222-828-3 C.I. Mordant Blue 9, disodium salt CAS 3624-68-8

Purity 97%+In StockPharmaceutical Standards
CAS No.3624-68-8
Molecular FormulaC16H25ClN2O8S2
Molecular WeightN/A
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

3624-68-8 Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate 1-Naphthalenesulfonic acid, 6-(2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2) 1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt EINECS 222-828-3 C.I. Mordant Blue 9, disodium salt CAS 3624-68-8 chemical structure

Description

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

3624-68-8 Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate 1-Naphthalenesulfonic acid, 6-(2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2) 1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt EINECS 222-828-3 C.I. Mordant Blue 9, disodium salt (CAS 3624-68-8) is a high-purity analytical reference standard with the molecular formula C16H25ClN2O8S2Na and a molecular weight of 495.94 g/mol.

Owing to a salt form, a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage, chlorine substitution, 3624-68-8 Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate 1-Naphthalenesulfonic acid, 6-(2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2) 1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt EINECS 222-828-3 C.I. Mordant Blue 9, disodium salt is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 495.94 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

Molecular FormulaC16H25ClN2O8S2 2*Na
Molecular Weight495.94 g/mol
Purity97%+
StorageStore in a cool place (≤25°C), protect from light, keep sealed and dry
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions
Degree of Unsaturation (DBE)5.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1958
Halogen ContentCl-containing
Nitrogen Atoms2
Sulfur Atoms2

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