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 Excited-State Proton Transfer and Conformational Relaxation of 2-(4′-Pyridyl)benzimidazole in Nafion Films, published in 2016, which mentions a compound: 2208-59-5, Name is 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, Molecular C12H9N3, SDS of cas: 2208-59-5.
The effect of annealing on the acidity and water uptake of Nafion films has been studied by using the acidity sensing fluorophore 2-(4′-pyridyl)benzimidazole (4PBI). The difference in acidity and the microenvironment of the fluorophore in annealed and nonannealed films is brought out in this study. The annealed film is found to have less water uptake than nonannealed films. The amount of water uptake increases upon acid treatment of the films, as all the steady-state and time-resolved behavior of the mol. in nonannealed films is restored. These observations are rationalized by the formation of anhydrides upon annealing and their hydrolysis to sulfonic acid groups upon acid treatment. Interestingly, the acidity of annealed films is found to be even less than that of Na+-exchanged films, indicating that annealing removes more protons from the Nafion films than cation exchange can.
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles