C6H3NH2

C6H3NH2 refers to an aminobenzene isomer. It is a chemical formula representing a benzene ring with the chemical formula C6H6, which has had one hydrogen atom replaced by an amino group (NH2) and another hydrogen atom replaced by a single hydrogen atom. This results in three distinct isomers based on the relative positions of the amino group and the remaining hydrogen atom on the benzene ring.

These isomers are collectively known as diaminobenzene or phenylenediamine. The three possible positional isomers are 1,2-diaminobenzene (ortho-phenylenediamine), 1,3-diaminobenzene (meta-phenylenediamine), and 1,4-diaminobenzene (para-phenylenediamine). Each isomer possesses unique chemical and physical properties due to the spatial arrangement of the amino groups and the remaining hydrogen.

Ortho-phenylenediamine is a colorless solid that turns reddish-brown on exposure to air. It is used in the synthesis of heterocyclic compounds, dyes, and pharmaceuticals. Meta-phenylenediamine is also a solid and is commonly employed in the production of dyes, hair coloring agents, and polymers. Para-phenylenediamine is known for its use in hair dyes and as a photographic developer, though its use has been restricted in some regions due to allergic reactions. The specific properties and applications of C6H3NH2 are therefore dependent on which of these three isomers is being discussed.