Absorption and fluorescence properties of acridinones, thioacridinones, aminoacridines and related crown ethers

We report a study on the absorptive and emissive properties of 9-acridinone s, 9-thioacridinones and 9-aminoacridines including six crown ether derivat ives. The effect of solvents and of the addition of cations (Na+, K+, Ca2and Mg2+) on these properties has been studied. The absorption of the crown ether derivative of 9-thioacridinone is sensitive to solvents while the fl uorescence of crown ethers derived from 9-aminoacridines shows some specifi city towards cations. Empirical modeling was used to discuss the emission c haracteristics of these compounds.