Terephthalic acid (data page)

This page provides supplementary chemical data on Terephthalic acid, the organic compound and one of three isomeric phthalic acids, all with formula C₆H₄(CO₂H)₂.

Material Safety Data Sheet

The handling of this chemical may require notable safety precautions, which are set forth on the Material Safety Datasheet (MSDS) for it.SIRI

Structure and properties

Structure and properties
Index of refraction, nD	?
Abbe number	?
Dielectric constant, εr	? ε0 at ? °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	?

Thermodynamic properties

Phase behavior
Triple point	? K (? °C), ? Pa
Critical point	? K (? °C), ? Pa
Std enthalpy change of fusion, ΔfusHo	? kJ/mol
Std entropy change of fusion, ΔfusSo	? J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo	? kJ/mol
Std entropy change of vaporization, ΔvapSo	? J/(mol·K)
Solid properties
Std enthalpy change of formation, ΔfHosolid	232 kJ/mol [1]
Standard molar entropy, Sosolid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	? kJ/mol
Standard molar entropy, Soliquid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
Gas properties
Std enthalpy change of formation, ΔfHogas	? kJ/mol
Standard molar entropy, Sogas	? J/(mol K)
Heat capacity, cp	? J/(mol K)

Spectral data

UV-Vis
λmax	240 nm
Extinction coefficient, ε	?
IR
Major absorption bands	? cm−1
NMR
Proton NMR
Carbon-13 NMR
Other NMR data
MS
Masses of main fragments

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• Except where noted otherwise, data relate to Standard temperature and pressure.
• Reliability of data general note.