C. J. p. SPRUIT AND A. SPRUIT-VAN DER BURG 



107 



spectra of these compounds are similar to the fluorescence spectra in 

 acid medium, but different from the fluorescence spectra in alkaHne 

 media, in which the luminescent reaction is carried out. It may be 

 added that for practically all compounds investigated, the fluorescence 



300 



400 



500 



600 nyj 



300 



400 



500 



600 mu 



Fig. 7. The absorption, fluorescence and chemiluminescence spectra of two deriva- 

 tives of dihydrophthalazinedione. Absorption and fluorescence spectra of 



acid solutions. Absorption and fluorescence spectra of solutions in 



0.01 N KOH Chemiluminescence spectra. 



