ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 



Ill 



(\ = 2573) and ^/X 4321 (X = 2314), appeai-s in the layer three millimetres 

 thick of the solution containing one milligram-molecule in 500 c.c, and 

 has nearly disappeared in the layer two millimetres thick of the same 

 solution. 



Quinone chlorimide. — A specimen of this substance was obtained by 

 reducing ;t?-nitro-phenol with tin and hydrochloric acid, and afterwards 

 oxidising the /j-amido-phenol thus obtained with an aqueous solution of 

 bleaching powder. The golden-yellow crystals melted at 85°. The 

 absorption spectra were photographed in alcoholic solution. The general 

 absorption is considerably less than in the case of nitroso-phenol ; a layer 



[ Curves of Molecular Vibratio7is. — (7) Quinone Chlorimide. 



two millimetres thick of a solution containing one milligram-molecule in 

 100 c.c. absorbs all rays beyond V^. 2884 (\ = 3467). 



In the corresponding layer of the solution containing one milligram- 

 molecule in 500 c.c. the spectrum is transmitted to ^/A 3148 (=3176), 

 beyond which the rays are absorbed up to ^/A 4321 (\ = 2314). 



The absorption band, which begins to appear at this dilution, can still 

 be traced in the layer three millimetres thick of the solution containing 

 one milligram-molecule in 12,500 c.c. 



Quinone dioxime. — This substance was prepared by the action of 

 hydroxylamine hydrochloride on hydroquinone. 



It melted with decomposition at 240°. Its absorption spectra in 

 filcoholic solution were photographed. 



