Structure-Photochemical Function Relationships in Nitrogen-Containing Heterocyclic Aromatic Photobases Derived from Quinoline was written by Alamudun, Sophya F.;Tanovitz, Kyle;Fajardo, April;Johnson, Kaitlind;Pham, Andy;Jamshidi Araghi, Tina;Petit, Andrew S.. And the article was included in Journal of Physical Chemistry A in 2020.COA of Formula: C10H9NO This article mentions the following:
Photobases are compounds that become strong bases after electronic excitation. Recent exptl. studies have highlighted the photobasicity of the 5-R quinoline compounds, demonstrating a strong substituent dependence to the pKa*. In this paper, we describe our systematic study of how the thermodn. driving force for photobasicity is tuned through substituents in four families of nitrogen-containing heterocyclic aromatics We show that substituent position and identity both significantly impact the pKa*. We demonstrate that the substituent effects are additive and identify many disubstituted compounds with substantially greater photobasicity than the most photobasic 5-R quinoline compound identified previously. We show that the addition of a second fused benzene ring to quinoline, along with two electron-donating substituents, lowers the S0 â?SPBS vertical excitation energy into the visible region while still maintaining a pKa* > 14. Overall, the structure-function relationships developed in this study provide new insights to guide the development of new photocatalysts that employ photobasicity. In the experiment, the researchers used many compounds, for example, 4-Methoxyisoquinoline (cas: 36034-54-5COA of Formula: C10H9NO).
4-Methoxyisoquinoline (cas: 36034-54-5) belongs to isoquinoline derivatives. Being an analog of pyridine, isoquinoline is a weak base, with a pKa of 5.14. It protonates to form salts upon treatment with strong acids, such as HCl. It forms adducts with Lewis acids, such as BF3.COA of Formula: C10H9NO
Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem