Solvent Effect on the Spectral Characteristics and Quantum Yields of the Photolysis of Alkylated 1,2-Dihydroquinolines

On the basis of spectral data and the reaction of photolysis and fluorescence quantum yields in different pure solvents and solvent mixtures, it has been concluded that hydrogen bonding between 1,2-dihydroquinolines (DHQs) and a solvent, where the solvent is a proton donor, plays the key role in the reaction of photoinduced solvent addition to the DHQ double bond. The high sensitivity of DHQ photolysis to the solvent composition was shown, allowing us to suggest this reaction as a probe for studying the microenvironment of related compounds in mixtures.