Luminescence properties of novel soluble quinacridones

Some 5,12-N,N-dialkyl-2,9-dialkyloxy quinacridones were synthesized. These compounds have good solubility in organic solvents such as dichloromethane, chloroform, acetone, ethyl acetate and their spectral properties were also investigated. The comparison of absorption spectra and fluorescence spectra of these soluble quinacridones between in solutions and in solid film indicated that the formation of intermolecular hydrogen bonds in the crystalline was obstructed by N-alkylation. The fluorescence lifetime of the soluble quinacridone was measured by single-photon counting technique. The longer fluorescence lifetime (ca. 20 ns)of the compound seems to be hopeful for the luminescence application. (C) 2000 Elsevier Science B.V. All rights reserved.