186 



LIGHT AND LIFE 



TABLE 1 



ClIKMILUMINKSCKNCK AND FLUORESCENCE VAI.I'KS FOR THl PlITHALAZINEDIONES 



ADDITIONAL RKI. A IIVE CHEMILUMINESC-EM IXIENSIIIES (9, 10) 

 5-Br > 6-Br > 6-1 > none > 5 -CH3 

 5.8-di(NHCOCH3) > 5-NHCOCH3> 5-CI > none>67-di (CI) 



largely at the light-emission stage and that the efficiency of the various 

 hydrazides in cheniiluniinescence is also determined at this point. Con- 

 sistent with this view is the fact that the rates of oxidation of a 

 number of hydrazides that differ markedly in their light output are 

 the same (32). 



The Chemihnniriescent Reaction in Water 

 The chemiluminescence of luminol and related hydrazides has 



