Spectral properties of 7H,9H-quinazolino[3,2-b]-benz[d,e]isoquinolin-7-one

The basic spectral properties (absorption and emission spectra, emission anisotropy and emission lifetime) of 7H,9H-quinazolino3,2-b]benzd,e]isoquinolin-7-one were measured and compared with theoretical predictions.On the basis of Perrin's and Kawski's theories the rotatory motion of the dye was also studied. The electric dipole moments in both ground and excited states and the orientation of the transition moments were obtained.