《Electronic Finetuning of 8-Methoxy Psoralens by Palladium-Catalyzed Coupling: Acidochromicity and Solvatochromicity》 was written by Geenen, Sarah R.; Presser, Lysander; Hoelzel, Torsten; Ganter, Christian; Mueller, Thomas J. J.. Formula: C7H5N And the article was included in Chemistry – A European Journal in 2020. The article conveys some information:
Differently 5-substituted 8-methoxypsoralens can be synthesized by an efficient synthetic route with various cross-coupling methodologies, such as Suzuki, Sonogashira and Heck reaction. Compared to previously synthesized psoralens, thereby promising daylight absorbing compounds as potentially active agents against certain skin diseases can be readily accessed. Extensive investigations of all synthesized psoralen derivatives reveal fluorescence in the solid state as well as several distinctly emissive derivatives in solution Donor-substituted psoralens exhibit remarkable photophys. properties, such as high fluorescence quantum yields and pronounced emission solvatochromicity and acidochromicity, which were scrutinized by Lippert-Mataga and Stern-Volmer plots. The results indicate that the compounds exceed the limit of visible light, a significant factor for potential applications as an active agent. In addition, (TD)DFT calculations were performed to elucidate the underlying electronic structure and to assign exptl. obtained data. In the experiment, the researchers used many compounds, for example, 4-Ethynylpyridine(cas: 2510-22-7Formula: C7H5N)
4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Formula: C7H5N