C9H11N

C9H11N is the molecular formula for a number of different organic compounds rather than a single substance. The formula does not specify how the carbon, hydrogen, and nitrogen atoms are connected, so many constitutional isomers can share this same composition.

The molecular weight of C9H11N is approximately 133.19 g/mol, and the degree of unsaturation is 5. This indicates combinations of rings and multiple bonds, most commonly including aromatic rings and/or heteroaromatic systems, but the exact structure varies among isomers.

Isomers with this formula can include aryl amines with various alkyl or aryl substituents on the ring, as well as heterocyclic amines in which a nitrogen-containing ring satisfies the total of nine carbons and one nitrogen. In practice, the physical properties—melting point, boiling point, and solubility—differ widely among these isomers, so C9H11N can appear as solids, liquids, or oils depending on connectivity and substituents.

Occurrence and use vary by isomer. Compounds with this formula are encountered in chemical catalogs and may serve as intermediates in pharmaceutical synthesis, dye chemistry, or materials research. They are typically accessed through standard organic reactions such as amination, alkylation, or ring-forming processes, tailored to the desired structural class.

Safety considerations apply to all amine-containing compounds: many C9H11N isomers can be irritants or hazardous if inhaled, ingested, or absorbed through the skin. Appropriate laboratory handling, ventilation, and personal protective equipment are advised.