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 Probing Sulfur Chemical and Electronic Structure with Experimental Observation and Quantitative Theoretical Prediction of Kα and Valence-to-Core Kβ X-ray Emission Spectroscopy, published in 2020-07-02, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, HPLC of Formula: 4556-23-4.
An extensive exptl. and theor. study of the Kα and Kβ high-resolution X-ray emission spectroscopy (XES) of sulfur-bearing systems is presented. This study encompasses a wide range of organic and inorganic compounds, including numerous exptl. spectra from both prior published work and new measurements. Employing a linear-response time-dependent d. functional theory (LR-TDDFT) approach, strong quant. agreement is found in the calculation of energy shifts of the core-to-core Kα as well as the full range of spectral features in the valence-to-core Kβ spectrum. The ability to accurately calculate the sulfur Kα energy shift supports the use of sulfur Kα XES as a bulk-sensitive tool for assessing sulfur speciation. The fine structure of the sulfur Kβ spectrum, in conjunction with the theor. results, is shown to be sensitive to the local electronic structure including effects of symmetry, ligand type and number, and, in the case of organosulfur compounds, to the nature of the bonded organic moiety. This agreement between theory and experiment, augmented by the potential for high-access XES measurements with the latest generation of laboratory-based spectrometers, demonstrates the possibility of broad anal. use of XES for sulfur and nearby third-row elements. The effective solution of the forward problem, i.e., successful prediction of detailed spectra from known mol. structure, also suggests future use of supervised machine learning approaches to exptl. inference, as has seen recent interest for interpretation of X-ray absorption near-edge structure (XANES).
There is still a lot of research devoted to this compound(SMILES：SC1=CC=NC=C1)HPLC of Formula: 4556-23-4, and with the development of science, more effects of this compound(4556-23-4) can be discovered.
Reference:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts