In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Spectral data of substituted naphthyridines. V. The IR spectra of substituted 1,8-naphthyridines, published in 1979, which mentions a compound: 1569-17-1, Name is 4-Methyl-1,8-naphthyridine, Molecular C9H8N2, SDS of cas: 1569-17-1.
In general the IR spectra of 1,8-naphthyridines show a ring bending (skeletal) vibration at 690-740-cm-1, three adjacent H absorption at 750-795 and 810-885 cm-1, two adjacent H absorptions at 785-855 cm-1 and isolated H absorptions at 795-810 and 885-920 cm-1.
Here is just a brief introduction to this compound(1569-17-1)SDS of cas: 1569-17-1, more information about the compound(4-Methyl-1,8-naphthyridine) is in the article, you can click the link below.
Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem