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 Ultraviolet spectra of the chloropyridines and chlorinated pyridines possessing a sulfur (0SR), nitrogen (-NR2), or oxygen (-OR) substituent in either the 2 or 4 position. Convenient method for distinguishing such positional isomers, published in 1974, which mentions a compound: 33216-52-3, Name is 3,4,5-Trichloropyridine, Molecular C5H2Cl3N, Recommanded Product: 33216-52-3.
A correlation is established between the position (2 versus 4) of the S, N, or O substituent on the chlorinated pyridines and their uv spectra. The chlorinated pyridines with S, N, or O substitution at the 2-position give uv spectra whose longest wavelength absorption maxima are enhanced (moved to a greater wavelength and an increased extinction coefficient) when compared to the spectra of the 4-substituted isomers. The number of Cl atoms, and not their position, is the more significant factor in determining the overall character of the spectra.
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Reference:
Bromide – Wikipedia,
bromide – Wiktionary