M-Phenylenediamine

M-Phenylenediamine (also known as meta-Phenylenediamine or mPDA) is an organic compound with the formula C6H4(NH2)2. It is one of three isomers of phenylenediamine, the others being o-Phenylenediamine and p-Phenylenediamine.

Structure and Properties

M-Phenylenediamine is a white solid, although commercial samples can appear dark due to the presence of impurities. It is slightly soluble in water and denser than water. It is a diamine, meaning it has two amine groups, which are located on the meta positions of the benzene ring.

Synthesis

M-Phenylenediamine is produced by the hydrogenation of 1,3-dinitrobenzene. The dinitrobenzene is prepared by dinitration of benzene.

Applications

M-Phenylenediamine is used in the manufacture of benzimidazoles, which are used as corrosion inhibitors in the steam condensate lines of power plants. It is also used in the production of rubber chemicals, textile dyes and pigments.

Health Effects

Exposure to m-Phenylenediamine can cause skin, eye, and respiratory tract irritation. It is also a sensitizer, which means it can cause allergic reactions. Long-term exposure can lead to more serious health effects, such as asthma and other respiratory diseases.

Safety and Precautions

M-Phenylenediamine should be handled with care. It should be stored in a cool, dry place, away from heat and open flames. In case of contact with skin or eyes, rinse immediately with plenty of water and seek medical advice.

See Also

• Benzene
• Amine
• Benzimidazole