4-Sulfophthalic Acid (contains 3-Sulfophthalic Acid) (ca 50% in Water) TCI S0136

Chemical Identity

CAS No.: 89-08-7
PubChem: CID 6962·SID 87575739
Formula: C8H6O7S
Molecular weight: 246.20 g/mol
Reference databases: ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 4-sulfophthalic acid
SMILES: C1=CC(=C(C=C1S(=O)(=O)O)C(=O)O)C(=O)O
InChIKey: WNKQDGLSQUASME-UHFFFAOYSA-N

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Volume 25mL 500mL

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4-Sulfophthalic Acid from TCI (product code S0136) is an aromatic acid with two carboxylic acid groups and one sulfonic acid group on a single benzene ring. It is supplied as an aqueous solution at approximately 50% concentration and also contains the isomer 3-sulfophthalic acid. In the laboratory it serves as a versatile non-heterocyclic building block. Its sulfonic acid group is strongly acidic, and its two carboxylic acid groups can take part in esterification, polycondensation and metal coordination. This makes it useful in synthesis, catalysis and materials science.

Several properties make this material a preferred choice. The sulfonic acid group gives it high acidity, so the compound can act as a water-soluble Brønsted acid catalyst that is easier to handle than concentrated mineral acids. Because it carries three acidic groups on one aromatic ring, it works as a multifunctional ligand or monomer for building polymer networks and coordination frameworks. Supplying it as a solution in water makes volumetric dosing simple and avoids the dust and hygroscopicity problems often seen with solid sulfonic acids. Users should note that the product is a mixture of isomers and allow for this when planning experiments and interpreting results.

In Indonesia, this material suits university research laboratories, industrial R&D facilities and materials science groups that work on organic synthesis, acid catalysis, polymer chemistry or coordination chemistry. Researchers who need a water-compatible strong acid with extra carboxylic functionality can use it both as a reagent and as a structural building block. Because it comes ready to use as an aqueous solution, it fits well into routine bench workflows where accurate liquid dosing matters. The isomer mixture should be documented in laboratory records and experimental reports.

Related TCI products

Brønsted acid catalysis: the strongly acidic sulfonic acid group lets it act as a water-soluble acid catalyst that is easier and safer to handle than concentrated mineral acids.
Esterification reactions: the two carboxylic acid groups can be converted into esters, making the compound a useful starting material for functionalized aromatic esters and related synthetic intermediates.
Polycondensation and polymer synthesis: three acid groups on one aromatic ring allow it to act as a multifunctional monomer for building crosslinked or functional polymer networks in materials research.
Coordination chemistry and framework materials: the carboxylic and sulfonic acid groups can coordinate to metal ions, so it works as a multifunctional ligand for building coordination frameworks.
General non-heterocyclic building block work: as an aromatic acid with mixed functional groups, it gives synthetic chemists a flexible scaffold for introducing sulfonic and carboxylic functionality into target molecules.

Brand	TCI (product code S0136)
CAS number	89-08-7
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	available in standard TCI pack sizes; please check the product listing for current options
Physical form	aqueous solution, approximately 50% in water, contains 3-sulfophthalic acid
Storage	keep tightly closed in a cool, dry, well-ventilated place, following the TCI label and Safety Data Sheet

Keep the container tightly closed in its original packaging, or in a compatible chemically resistant container, in a cool, dry and well-ventilated area away from direct sunlight and incompatible materials such as strong bases and oxidizing agents. Because the product is a strongly acidic aqueous solution, wear chemical-resistant gloves, safety goggles and a lab coat when handling it. Work in a fume hood or a well-ventilated area, avoid contact with skin and eyes, and clean up spills promptly. Always consult the TCI Safety Data Sheet and follow local regulations for handling and disposal.

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