In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Nature of conjugation in the 2-(pyridyl)benzimidazole system, published in 1981-02-28, which mentions a compound: 2208-59-5, mainly applied to benzimidazole pyridyl quinolyl spectra basicity; pyridylbenzimidazole UV basicity fluorescence; quinolylbenzimidazole UV basicity fluorescence; fluorescence pyridylbenzimidazole quinolylbenzimidazole; basicity pyridylbenzimidazole quinolylbenzimidazole UV; benzoxazole quinolyl spectra basicity; benzothiazole quinolyl spectra basicity, SDS of cas: 2208-59-5.
UV absorption and fluorescence spectra of I (R = H, Me; R1 = 2- and 4-pyridyl, 2-quinolyl) and II (X = O, S) were measured in different solvents, and the basicities were determined in 50% aqueous EtOH. Conjugation between the 2 heterocyclic parts of I reduced the π-electron d. in both, and thus lowered the basicity.
Compounds in my other articles are similar to this one(2-(Pyridin-4-yl)-1H-benzo[d]imidazole)SDS of cas: 2208-59-5, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.
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