Isophthalic acid
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Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. This colorless solid is an isomer of phthalic acid and terephthalic acid. The main industrial uses of purified isophthalic acid (PIA) are for the production of polyethylene terephthalate (PET) resin and for the production of unsaturated polyester resin (UPR) and other types of coating resins.
Quick Facts Names, Identifiers ...
Names | |
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Preferred IUPAC name
Benzene-1,3-dicarboxylic acid | |
Other names
Isophthalic acid meta-Phthalic acid | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.004.098 |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C8H6O4 | |
Molar mass | 166.132 g·mol−1 |
Appearance | White crystalline solid |
Density | 1.526 g/cm3, Solid |
Insoluble | |
Acidity (pKa) | 3.46, 4.46[1] |
-84.64·10−6 cm3/mol | |
Related compounds | |
Related carboxylic acids |
Benzoic acid Phthalic acid (ortho) Terephthalic acid (para) Trimesic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Isophthalic acid is one of three isomers of benzenedicarboxylic acid, the others being phthalic acid and terephthalic acid.
Crystalline isophthalic acid is built up from molecules connected by hydrogen bonds, forming infinite chains.[2]