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4-Aminobenzoic Acid Para-Aminobenzoic Acid (PABA)
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Description
4-Aminobenzoic Acid
Other Names: p-Aminobenzoic acid, PABA, para-Aminobenzoic acid
CAS Number: 150-13-0
Sum Formula: C₇H₇NO₂
Molar Mass: 137.14 g/mol
Appearance: White to slightly beige crystalline powder
4-Aminobenzoic acid (PABA) is an aromatic amino acid derivative consisting of a benzene ring substituted with an amino group in the para position relative to a carboxylic acid group. It is a versatile intermediate in organic synthesis and is known for its role in various chemical and material science applications.
Chemical and Physical Properties
Density: ~1.38 g/cm³
Melting Point: 187–189°C
Boiling Point: Decomposes before boiling
Solubility in Water: Slightly soluble (~4.5 g/L at 25°C)
Solubility in Other Solvents: Soluble in ethanol, ether, and acetone
Odor: Odorless
Applications
Organic Synthesis: Used as a precursor for azo dyes, esters, and other para-substituted benzene derivatives.
Polymer Chemistry: Incorporated into specialty polymers and as a monomer in resin formulations.
Photochemistry: Investigated in UV-absorbing systems and photoresponsive materials.
Analytical Chemistry: Employed in various chemical assays and as a reference compound.
Surface Chemistry: Used in functional coatings and in surface modification of materials.
Safety
Signal Word: Warning
H315 (32.2%): Causes skin irritation [Warning Skin corrosion/irritation]
H317 (27.7%): May cause an allergic skin reaction [Warning Sensitization, Skin]
H319 (33.1%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H335 (32.2%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
H412 (44.6%): Harmful to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]
P261, P264, P264+P265, P271, P272, P273, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P333+P317, P337+P317, P362+P364, P403+P233, P405, and P501
Handling and Storage
Storage Conditions: Store in a tightly sealed container in a cool, dry, and well-ventilated location. Protect from strong oxidizers and direct light.
Handling Precautions: Avoid formation of dust and contact with eyes, skin, and clothing. Use standard PPE and handle according to good laboratory and industrial practices.