C15H11N3O

C15H11N3O is a molecular formula used to describe a class of organic compounds. It does not specify a single structure; many structural isomers can satisfy this formula. In chemical databases, it may correspond to several distinct compounds with different arrangements of carbon, hydrogen, nitrogen, and oxygen.

The formula contains 15 carbon atoms, 11 hydrogen atoms, 3 nitrogen atoms, and 1 oxygen atom. Its approximate molecular weight is 249.27 g/mol. Its degree of unsaturation is 12, calculated by the formula DU = C - H/2 + N/2 + 1, which indicates a high level of pi bonds and/or ring systems. This level of unsaturation is commonly associated with multiple aromatic rings or fused heterocyclic frameworks.

Structural possibilities for C15H11N3O include aromatic or heteroaromatic cores, potentially with fused rings. The three nitrogens suggest the presence of nitrogen-containing heterocycles such as triazole, imidazole, or pyridine-type units in some isomers. The single oxygen atom could be part of a carbonyl group, an ether, or a phenoxy linkage, among other configurations. Because the formula permits many isomers, exact functional groups and connectivity vary across structures sharing the same formula.

Analytical identification of a specific compound with this formula requires spectroscopic data (for example, NMR, MS) and, ideally, crystallographic information to determine the precise arrangement of atoms. Without a defined structure, properties such as solubility, reactivity, and biological activity cannot be uniquely assigned.

See also: molecular formula, isomer, chemical databases.