Tuning the Photophysical Properties of 2-Quinolinone-Based Donor-Acceptor Molecules through<i>N</i>- versus<i>O</i>-Alkylation: Insights from Experimental and Theoretical Investigations
systems with three different acceptor groups and N/O-alkylated quinolinone compounds have been synthesised in an attempt to understand their optical properties. All the compounds were characterised by 1H NMR, 13C NMR and mass analysis. Absorption measurements revealed that charge-transfer transition was observed by introducing electron-withdrawing acceptor groups. Alkylation of 2-quinolinone at the O-position