VOL. 12 (1953) CARCINOGENIC COMPOUNDS, PURINES AND NUCLEIC ACID 



81 



TABLE II 



SOLUBILITY OF 3 :4-6 ly-DIBENZACRIDINE IN CAFFEINE AND SODIUM DEOXYRIBONUCLEATE SOLUTIONS 



Caffeine 



Caffeine cone, 

 (ft mols/i) 



DBA cone, 

 (/i mols/i) 



Sodium Deoxyribonucleate 



M.R. 



DNA cone, 

 {fimols/i) 



DBA cone. 

 (nmolsU) 



M.R. 



and dried. The properties of compounds prepared in this way are shown in Table III. 

 i:2-6:7-Dibenzacridine was not sufficiently soluble in ethanol to prepare a molecular 

 compound by this method. 



Spectrophotometric analysis of the molecular compounds. Absorption spectra of 

 benzene or ethanol solutions of the molecular compounds of hydrocarbons prepared by 

 Weil-Malherbe [e.g. i mol. 3 : 4-benzpyrene + 2 mols. tetramethyluric acid) and of the 

 dibenzcarbazole and dibenzacridine complexes were found to be the sum of the ab- 



360 380 wo 

 Wavelength Cm/n) 



Fig. 6. Absorption spectra of 3 : 4-benzpyrene- 

 tetramethyluric acid compound and its com- 

 ponents in benzene. , 3 : 4-benzpyrene ; 



, tetramethyluric acid ; , molecular 



compound; - , calculated curve for i mol. 



3 : 4-benzpyrene -j- 2 mols. tetramethyluric acid. 



References p. 87. 



320 340 360 

 Wavelength (irtf/.) 



Fig. 7. Absorption spectra of 3 :4-5:6-dibenz- 

 carbazole-cafEeine compound and its components 



in ethanol. , 3:4-5: 6-dibenzcarbazole ; 



caffeine; , molecular compound; , 



calculated curve for i mol. 3 : 4-5: 6-dibenz- 

 carbazole + I mol. caffeine. 



