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 Crystal Field Effects on Atomic and Functional-Group Distributed Polarizabilities of Molecular Materials, published in 2020-12-03, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, Electric Literature of C5H5NS.
To rationally design new mol. materials with desirable linear optical properties, such as refractive index or birefringence, we investigated how at. and functional-group polarizability tensors of prototypical mols. respond to crystal field effects. By building finite aggregates of urea, succinic acid, p-nitroaniline, 4-mercaptopyridine, or methylbenzoate, and by partitioning the cluster electronic d. using quantum theory of atoms in mols., we could extract atoms and functional groups from the aggregates and estimate their polarizability enhancements with respect to values calculated for mols. in isolation. The isotropic polarizability and its anisotropy for the mol. building blocks are used to understand the functional-group sources of optical properties in these model systems, which could help the synthetic chemist to fabricate efficient materials. This anal. is complemented by benchmarking d. functionals for at. distributed polarizabilities in gas phase, by comparing the results with refractive-index calculations under periodic boundary conditions, and by estimating functional-group optical properties from a classical electrostatic atom-dipole interaction model.
In addition to the literature in the link below, there is a lot of literature about this compound(Pyridine-4-thiol)Electric Literature of C5H5NS, illustrating the importance and wide applicability of this compound(4556-23-4).
Reference:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts